use alloc::vec::Vec;
use alloc::string::String;
use alloc::string::ToString;
use crate::rustc_errors::codes::*;
use crate::rustc_errors::{
Applicability, Diag, DiagArgValue, DiagCtxtHandle, Diagnostic, EmissionGuarantee, Level,
MultiSpan, Subdiagnostic, msg,
};
use rustc_macros::{Diagnostic, Subdiagnostic};
use crate::rustc_middle::ty::{self, Ty};
use crate::rustc_pattern_analysis::diagnostics::Uncovered;
use crate::rustc_pattern_analysis::rustc::RustcPatCtxt;
use crate::rustc_span::{Ident, Span, Symbol};
#[derive(Diagnostic)]
#[diag("call to deprecated safe function `{$function}` is unsafe and requires unsafe block")]
pub(crate) struct CallToDeprecatedSafeFnRequiresUnsafe {
#[label("call to unsafe function")]
pub(crate) span: Span,
pub(crate) function: String,
#[subdiagnostic]
pub(crate) sub: CallToDeprecatedSafeFnRequiresUnsafeSub,
}
#[derive(Subdiagnostic)]
#[multipart_suggestion(
"you can wrap the call in an `unsafe` block if you can guarantee {$guarantee}",
applicability = "machine-applicable"
)]
pub(crate) struct CallToDeprecatedSafeFnRequiresUnsafeSub {
pub(crate) start_of_line_suggestion: String,
#[suggestion_part(code = "{start_of_line_suggestion}")]
pub(crate) start_of_line: Span,
#[suggestion_part(code = "unsafe {{ ")]
pub(crate) left: Span,
#[suggestion_part(code = " }}")]
pub(crate) right: Span,
pub(crate) guarantee: String,
}
#[derive(Diagnostic)]
#[diag("call to unsafe function `{$function}` is unsafe and requires unsafe block", code = E0133)]
#[note("consult the function's documentation for information on how to avoid undefined behavior")]
pub(crate) struct UnsafeOpInUnsafeFnCallToUnsafeFunctionRequiresUnsafe {
#[label("call to unsafe function")]
pub(crate) span: Span,
pub(crate) function: String,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("call to unsafe function is unsafe and requires unsafe block", code = E0133)]
#[note("consult the function's documentation for information on how to avoid undefined behavior")]
pub(crate) struct UnsafeOpInUnsafeFnCallToUnsafeFunctionRequiresUnsafeNameless {
#[label("call to unsafe function")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("use of inline assembly is unsafe and requires unsafe block", code = E0133)]
#[note("inline assembly is entirely unchecked and can cause undefined behavior")]
pub(crate) struct UnsafeOpInUnsafeFnUseOfInlineAssemblyRequiresUnsafe {
#[label("use of inline assembly")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("initializing type with an unsafe field is unsafe and requires unsafe block", code = E0133)]
#[note("unsafe fields may carry library invariants")]
pub(crate) struct UnsafeOpInUnsafeFnInitializingTypeWithUnsafeFieldRequiresUnsafe {
#[label("initialization of struct with unsafe field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("use of mutable static is unsafe and requires unsafe block", code = E0133)]
#[note(
"mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior"
)]
pub(crate) struct UnsafeOpInUnsafeFnUseOfMutableStaticRequiresUnsafe {
#[label("use of mutable static")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("use of extern static is unsafe and requires unsafe block", code = E0133)]
#[note(
"extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior"
)]
pub(crate) struct UnsafeOpInUnsafeFnUseOfExternStaticRequiresUnsafe {
#[label("use of extern static")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("use of unsafe field is unsafe and requires unsafe block", code = E0133)]
#[note("unsafe fields may carry library invariants")]
pub(crate) struct UnsafeOpInUnsafeFnUseOfUnsafeFieldRequiresUnsafe {
#[label("use of unsafe field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("dereference of raw pointer is unsafe and requires unsafe block", code = E0133)]
#[note(
"raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior"
)]
pub(crate) struct UnsafeOpInUnsafeFnDerefOfRawPointerRequiresUnsafe {
#[label("dereference of raw pointer")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("access to union field is unsafe and requires unsafe block", code = E0133)]
#[note(
"the field may not be properly initialized: using uninitialized data will cause undefined behavior"
)]
pub(crate) struct UnsafeOpInUnsafeFnAccessToUnionFieldRequiresUnsafe {
#[label("access to union field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag(
"mutation of layout constrained field is unsafe and requires unsafe block",
code = E0133
)]
#[note("mutating layout constrained fields cannot statically be checked for valid values")]
pub(crate) struct UnsafeOpInUnsafeFnMutationOfLayoutConstrainedFieldRequiresUnsafe {
#[label("mutation of layout constrained field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag(
"borrow of layout constrained field with interior mutability is unsafe and requires unsafe block",
code = E0133,
)]
pub(crate) struct UnsafeOpInUnsafeFnBorrowOfLayoutConstrainedFieldRequiresUnsafe {
#[label("borrow of layout constrained field with interior mutability")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag(
"unsafe binder cast is unsafe and requires unsafe block information that may be required to uphold safety guarantees of a type",
code = E0133,
)]
pub(crate) struct UnsafeOpInUnsafeFnUnsafeBinderCastRequiresUnsafe {
#[label("unsafe binder cast")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block", code = E0133)]
#[help(
"in order for the call to be safe, the context requires the following additional target {$missing_target_features_count ->
[1] feature
*[count] features
}: {$missing_target_features}"
)]
pub(crate) struct UnsafeOpInUnsafeFnCallToFunctionWithRequiresUnsafe {
#[label("call to function with `#[target_feature]`")]
pub(crate) span: Span,
pub(crate) function: String,
pub(crate) missing_target_features: DiagArgValue,
pub(crate) missing_target_features_count: usize,
#[note("the {$build_target_features} target {$build_target_features_count ->
[1] feature
*[count] features
} being enabled in the build configuration does not remove the requirement to list {$build_target_features_count ->
[1] it
*[count] them
} in `#[target_feature]`")]
pub(crate) note: bool,
pub(crate) build_target_features: DiagArgValue,
pub(crate) build_target_features_count: usize,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedLintNote>,
}
#[derive(Diagnostic)]
#[diag("call to unsafe function `{$function}` is unsafe and requires unsafe block", code = E0133)]
#[note("consult the function's documentation for information on how to avoid undefined behavior")]
pub(crate) struct CallToUnsafeFunctionRequiresUnsafe {
#[primary_span]
#[label("call to unsafe function")]
pub(crate) span: Span,
pub(crate) function: String,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("call to unsafe function is unsafe and requires unsafe block", code = E0133)]
#[note("consult the function's documentation for information on how to avoid undefined behavior")]
pub(crate) struct CallToUnsafeFunctionRequiresUnsafeNameless {
#[primary_span]
#[label("call to unsafe function")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("call to unsafe function `{$function}` is unsafe and requires unsafe function or block", code = E0133)]
#[note("consult the function's documentation for information on how to avoid undefined behavior")]
pub(crate) struct CallToUnsafeFunctionRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("call to unsafe function")]
pub(crate) span: Span,
pub(crate) function: String,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"call to unsafe function is unsafe and requires unsafe function or block",
code = E0133
)]
#[note("consult the function's documentation for information on how to avoid undefined behavior")]
pub(crate) struct CallToUnsafeFunctionRequiresUnsafeNamelessUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("call to unsafe function")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of inline assembly is unsafe and requires unsafe block", code = E0133)]
#[note("inline assembly is entirely unchecked and can cause undefined behavior")]
pub(crate) struct UseOfInlineAssemblyRequiresUnsafe {
#[primary_span]
#[label("use of inline assembly")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of inline assembly is unsafe and requires unsafe function or block", code = E0133)]
#[note("inline assembly is entirely unchecked and can cause undefined behavior")]
pub(crate) struct UseOfInlineAssemblyRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("use of inline assembly")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("initializing type with an unsafe field is unsafe and requires unsafe block", code = E0133)]
#[note("unsafe fields may carry library invariants")]
pub(crate) struct InitializingTypeWithUnsafeFieldRequiresUnsafe {
#[primary_span]
#[label("initialization of struct with unsafe field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"initializing type with an unsafe field is unsafe and requires unsafe block",
code = E0133
)]
#[note("unsafe fields may carry library invariants")]
pub(crate) struct InitializingTypeWithUnsafeFieldRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("initialization of struct with unsafe field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of mutable static is unsafe and requires unsafe block", code = E0133)]
#[note(
"mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior"
)]
pub(crate) struct UseOfMutableStaticRequiresUnsafe {
#[primary_span]
#[label("use of mutable static")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of mutable static is unsafe and requires unsafe function or block", code = E0133)]
#[note(
"mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior"
)]
pub(crate) struct UseOfMutableStaticRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("use of mutable static")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of extern static is unsafe and requires unsafe block", code = E0133)]
#[note(
"extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior"
)]
pub(crate) struct UseOfExternStaticRequiresUnsafe {
#[primary_span]
#[label("use of extern static")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of extern static is unsafe and requires unsafe function or block", code = E0133)]
#[note(
"extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior"
)]
pub(crate) struct UseOfExternStaticRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("use of extern static")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of unsafe field is unsafe and requires unsafe block", code = E0133)]
#[note("unsafe fields may carry library invariants")]
pub(crate) struct UseOfUnsafeFieldRequiresUnsafe {
#[primary_span]
#[label("use of unsafe field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("use of unsafe field is unsafe and requires unsafe block", code = E0133)]
#[note("unsafe fields may carry library invariants")]
pub(crate) struct UseOfUnsafeFieldRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("use of unsafe field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("dereference of raw pointer is unsafe and requires unsafe block", code = E0133)]
#[note(
"raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior"
)]
pub(crate) struct DerefOfRawPointerRequiresUnsafe {
#[primary_span]
#[label("dereference of raw pointer")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("dereference of raw pointer is unsafe and requires unsafe function or block", code = E0133)]
#[note(
"raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior"
)]
pub(crate) struct DerefOfRawPointerRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("dereference of raw pointer")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("access to union field is unsafe and requires unsafe block", code = E0133)]
#[note(
"the field may not be properly initialized: using uninitialized data will cause undefined behavior"
)]
pub(crate) struct AccessToUnionFieldRequiresUnsafe {
#[primary_span]
#[label("access to union field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("access to union field is unsafe and requires unsafe function or block", code = E0133)]
#[note(
"the field may not be properly initialized: using uninitialized data will cause undefined behavior"
)]
pub(crate) struct AccessToUnionFieldRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("access to union field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("mutation of layout constrained field is unsafe and requires unsafe block", code = E0133)]
#[note("mutating layout constrained fields cannot statically be checked for valid values")]
pub(crate) struct MutationOfLayoutConstrainedFieldRequiresUnsafe {
#[primary_span]
#[label("mutation of layout constrained field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"mutation of layout constrained field is unsafe and requires unsafe function or block",
code = E0133
)]
#[note("mutating layout constrained fields cannot statically be checked for valid values")]
pub(crate) struct MutationOfLayoutConstrainedFieldRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("mutation of layout constrained field")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("borrow of layout constrained field with interior mutability is unsafe and requires unsafe block", code = E0133)]
#[note(
"references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values"
)]
pub(crate) struct BorrowOfLayoutConstrainedFieldRequiresUnsafe {
#[primary_span]
#[label("borrow of layout constrained field with interior mutability")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"borrow of layout constrained field with interior mutability is unsafe and requires unsafe function or block",
code = E0133
)]
#[note(
"references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values"
)]
pub(crate) struct BorrowOfLayoutConstrainedFieldRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("borrow of layout constrained field with interior mutability")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block", code = E0133)]
#[help(
"in order for the call to be safe, the context requires the following additional target {$missing_target_features_count ->
[1] feature
*[count] features
}: {$missing_target_features}"
)]
pub(crate) struct CallToFunctionWithRequiresUnsafe {
#[primary_span]
#[label("call to function with `#[target_feature]`")]
pub(crate) span: Span,
pub(crate) function: String,
pub(crate) missing_target_features: DiagArgValue,
pub(crate) missing_target_features_count: usize,
#[note("the {$build_target_features} target {$build_target_features_count ->
[1] feature
*[count] features
} being enabled in the build configuration does not remove the requirement to list {$build_target_features_count ->
[1] it
*[count] them
} in `#[target_feature]`")]
pub(crate) note: bool,
pub(crate) build_target_features: DiagArgValue,
pub(crate) build_target_features_count: usize,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe function or block",
code = E0133,
)]
#[help(
"in order for the call to be safe, the context requires the following additional target {$missing_target_features_count ->
[1] feature
*[count] features
}: {$missing_target_features}"
)]
pub(crate) struct CallToFunctionWithRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("call to function with `#[target_feature]`")]
pub(crate) span: Span,
pub(crate) function: String,
pub(crate) missing_target_features: DiagArgValue,
pub(crate) missing_target_features_count: usize,
#[note("the {$build_target_features} target {$build_target_features_count ->
[1] feature
*[count] features
} being enabled in the build configuration does not remove the requirement to list {$build_target_features_count ->
[1] it
*[count] them
} in `#[target_feature]`")]
pub(crate) note: bool,
pub(crate) build_target_features: DiagArgValue,
pub(crate) build_target_features_count: usize,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"unsafe binder cast is unsafe and requires unsafe block information that may be required to uphold safety guarantees of a type",
code = E0133,
)]
pub(crate) struct UnsafeBinderCastRequiresUnsafe {
#[primary_span]
#[label("unsafe binder cast")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag(
"unsafe binder cast is unsafe and requires unsafe block or unsafe fn information that may be required to uphold safety guarantees of a type",
code = E0133,
)]
pub(crate) struct UnsafeBinderCastRequiresUnsafeUnsafeOpInUnsafeFnAllowed {
#[primary_span]
#[label("unsafe binder cast")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Diagnostic)]
#[diag("call `{$function}` explicitly is unsafe and requires unsafe block", code = E0133)]
pub(crate) struct CallDropExplicitlyRequiresUnsafe {
#[primary_span]
pub(crate) span: Span,
pub(crate) function: String,
#[subdiagnostic]
pub(crate) unsafe_not_inherited_note: Option<UnsafeNotInheritedNote>,
}
#[derive(Subdiagnostic)]
#[label("items do not inherit unsafety from separate enclosing items")]
pub(crate) struct UnsafeNotInheritedNote {
#[primary_span]
pub(crate) span: Span,
}
pub(crate) struct UnsafeNotInheritedLintNote {
pub(crate) signature_span: Span,
pub(crate) body_span: Span,
}
impl Subdiagnostic for UnsafeNotInheritedLintNote {
fn add_to_diag<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
diag.span_note(
self.signature_span,
msg!("an unsafe function restricts its caller, but its body is safe by default"),
);
let body_start = self.body_span.shrink_to_lo();
let body_end = self.body_span.shrink_to_hi();
diag.tool_only_multipart_suggestion(
msg!("consider wrapping the function body in an unsafe block"),
vec![(body_start, "{ unsafe ".into()), (body_end, "}".into())],
Applicability::MachineApplicable,
);
}
}
#[derive(Diagnostic)]
#[diag("unnecessary `unsafe` block")]
pub(crate) struct UnusedUnsafe {
#[label("unnecessary `unsafe` block")]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) enclosing: Option<UnusedUnsafeEnclosing>,
}
#[derive(Subdiagnostic)]
pub(crate) enum UnusedUnsafeEnclosing {
#[label("because it's nested under this `unsafe` block")]
Block {
#[primary_span]
span: Span,
},
}
pub(crate) struct NonExhaustivePatternsTypeNotEmpty<'a, 'tcx> {
pub(crate) cx: &'a RustcPatCtxt<'a, 'tcx>,
pub(crate) scrut_span: Span,
pub(crate) braces_span: Option<Span>,
pub(crate) ty: Ty<'tcx>,
}
impl<'a, G: EmissionGuarantee> Diagnostic<'a, G> for NonExhaustivePatternsTypeNotEmpty<'_, '_> {
fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, G> {
let mut diag =
Diag::new(dcx, level, msg!("non-exhaustive patterns: type `{$ty}` is non-empty"));
diag.span(self.scrut_span);
diag.code(E0004);
let peeled_ty = self.ty.peel_refs();
diag.arg("ty", self.ty);
diag.arg("peeled_ty", peeled_ty);
if let ty::Adt(def, _) = peeled_ty.kind() {
let def_span = self
.cx
.tcx
.hir_get_if_local(def.did())
.and_then(|node| node.ident())
.map(|ident| ident.span)
.unwrap_or_else(|| self.cx.tcx.def_span(def.did()));
let mut span: MultiSpan = def_span.into();
span.push_span_label(def_span, "");
diag.span_note(span, msg!("`{$peeled_ty}` defined here"));
}
let is_non_exhaustive = matches!(self.ty.kind(),
ty::Adt(def, _) if def.variant_list_has_applicable_non_exhaustive());
if is_non_exhaustive {
diag.note(msg!(
"the matched value is of type `{$ty}`, which is marked as non-exhaustive"
));
} else {
diag.note(msg!("the matched value is of type `{$ty}`"));
}
if let ty::Ref(_, sub_ty, _) = self.ty.kind() {
if !sub_ty.is_inhabited_from(self.cx.tcx, self.cx.module, self.cx.typing_env) {
diag.note(msg!("references are always considered inhabited"));
}
}
let sm = self.cx.tcx.sess.source_map();
if let Some(braces_span) = self.braces_span {
let (indentation, more) = if let Some(snippet) = sm.indentation_before(self.scrut_span)
{
(format!("\n{snippet}"), " ")
} else {
(" ".to_string(), "")
};
diag.span_suggestion_verbose(
braces_span,
msg!("ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown"),
format!(" {{{indentation}{more}_ => todo!(),{indentation}}}"),
Applicability::HasPlaceholders,
);
} else {
diag.help(msg!(
"ensure that all possible cases are being handled by adding a match arm with a wildcard pattern"
));
}
diag
}
}
#[derive(Subdiagnostic)]
#[note("match arms with guards don't count towards exhaustivity")]
pub(crate) struct NonExhaustiveMatchAllArmsGuarded;
#[derive(Diagnostic)]
#[diag("statics cannot be referenced in patterns", code = E0158)]
pub(crate) struct StaticInPattern {
#[primary_span]
#[label("can't be used in patterns")]
pub(crate) span: Span,
#[label("`static` defined here")]
pub(crate) static_span: Span,
}
#[derive(Diagnostic)]
#[diag("constant parameters cannot be referenced in patterns", code = E0158)]
pub(crate) struct ConstParamInPattern {
#[primary_span]
#[label("can't be used in patterns")]
pub(crate) span: Span,
#[label("constant defined here")]
pub(crate) const_span: Span,
}
#[derive(Diagnostic)]
#[diag("runtime values cannot be referenced in patterns", code = E0080)]
pub(crate) struct NonConstPath {
#[primary_span]
#[label("references a runtime value")]
pub(crate) span: Span,
}
pub(crate) struct UnreachablePattern<'tcx> {
pub(crate) covered_by_many_n_more_count: Option<usize>,
pub(crate) inner: UnreachablePatternInner<'tcx>,
}
impl<'a, 'tcx, G: EmissionGuarantee> Diagnostic<'a, G> for UnreachablePattern<'tcx> {
#[track_caller]
fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, G> {
let mut diag = self.inner.into_diag(dcx, level);
if let Some(covered_by_many_n_more_count) = self.covered_by_many_n_more_count {
diag.arg("covered_by_many_n_more_count", covered_by_many_n_more_count);
}
diag
}
}
#[derive(Diagnostic)]
#[diag("unreachable pattern")]
pub(crate) struct UnreachablePatternInner<'tcx> {
#[label("no value can reach this")]
pub(crate) span: Option<Span>,
#[label("matches no values because `{$matches_no_values_ty}` is uninhabited")]
pub(crate) matches_no_values: Option<Span>,
pub(crate) matches_no_values_ty: Ty<'tcx>,
#[note(
"to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types"
)]
pub(crate) uninhabited_note: Option<()>,
#[label("matches any value")]
pub(crate) covered_by_catchall: Option<Span>,
#[subdiagnostic]
pub(crate) wanted_constant: Option<WantedConstant>,
#[note(
"there is a constant of the same name imported in another scope, which could have been used to pattern match against its value instead of introducing a new catch-all binding, but it needs to be imported in the pattern's scope"
)]
pub(crate) accessible_constant: Option<Span>,
#[note(
"there is a constant of the same name, which could have been used to pattern match against its value instead of introducing a new catch-all binding, but it is not accessible from this scope"
)]
pub(crate) inaccessible_constant: Option<Span>,
#[note(
"there is a binding of the same name; if you meant to pattern match against the value of that binding, that is a feature of constants that is not available for `let` bindings"
)]
pub(crate) pattern_let_binding: Option<Span>,
#[label("matches all the relevant values")]
pub(crate) covered_by_one: Option<Span>,
#[note("multiple earlier patterns match some of the same values")]
pub(crate) covered_by_many: Option<MultiSpan>,
#[suggestion("remove the match arm", code = "", applicability = "machine-applicable")]
pub(crate) suggest_remove: Option<Span>,
}
#[derive(Subdiagnostic)]
#[suggestion(
"you might have meant to pattern match against the value of {$is_typo ->
[true] similarly named constant
*[false] constant
} `{$const_name}` instead of introducing a new catch-all binding",
code = "{const_path}",
applicability = "machine-applicable"
)]
pub(crate) struct WantedConstant {
#[primary_span]
pub(crate) span: Span,
pub(crate) is_typo: bool,
pub(crate) const_name: String,
pub(crate) const_path: String,
}
#[derive(Diagnostic)]
#[diag("constant pattern cannot depend on generic parameters", code = E0158)]
pub(crate) struct ConstPatternDependsOnGenericParameter {
#[primary_span]
#[label("`const` depends on a generic parameter")]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag("could not evaluate constant pattern")]
pub(crate) struct CouldNotEvalConstPattern {
#[primary_span]
#[label("could not evaluate constant")]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag("lower bound for range pattern must be less than or equal to upper bound", code = E0030)]
pub(crate) struct LowerRangeBoundMustBeLessThanOrEqualToUpper {
#[primary_span]
#[label("lower bound larger than upper bound")]
pub(crate) span: Span,
#[note(
"when matching against a range, the compiler verifies that the range is non-empty. Range patterns include both end-points, so this is equivalent to requiring the start of the range to be less than or equal to the end of the range"
)]
pub(crate) teach: bool,
}
#[derive(Diagnostic)]
#[diag("literal out of range for `{$ty}`")]
pub(crate) struct LiteralOutOfRange<'tcx> {
#[primary_span]
#[label("this value does not fit into the type `{$ty}` whose range is `{$min}..={$max}`")]
pub(crate) span: Span,
pub(crate) ty: Ty<'tcx>,
pub(crate) min: i128,
pub(crate) max: u128,
}
#[derive(Diagnostic)]
#[diag("lower bound for range pattern must be less than upper bound", code = E0579)]
pub(crate) struct LowerRangeBoundMustBeLessThanUpper {
#[primary_span]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag("exclusive upper bound for a range bound cannot be the minimum", code = E0579)]
pub(crate) struct UpperRangeBoundCannotBeMin {
#[primary_span]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag("pattern binding `{$name}` is named the same as one of the variants of the type `{$ty_path}`", code = E0170)]
pub(crate) struct BindingsWithVariantName {
#[suggestion(
"to match on the variant, qualify the path",
code = "{ty_path}::{name}",
applicability = "machine-applicable"
)]
pub(crate) suggestion: Option<Span>,
pub(crate) ty_path: String,
pub(crate) name: Ident,
}
#[derive(Diagnostic)]
#[diag(
"irrefutable `if let` {$count ->
[one] pattern
*[other] patterns
}"
)]
#[note(
"{$count ->
[one] this pattern
*[other] these patterns
} will always match, so the `if let` is useless"
)]
#[help("consider replacing the `if let` with a `let`")]
pub(crate) struct IrrefutableLetPatternsIfLet {
pub(crate) count: usize,
}
#[derive(Diagnostic)]
#[diag(
"irrefutable `if let` guard {$count ->
[one] pattern
*[other] patterns
}"
)]
#[note(
"{$count ->
[one] this pattern
*[other] these patterns
} will always match, so the guard is useless"
)]
#[help("consider removing the guard and adding a `let` inside the match arm")]
pub(crate) struct IrrefutableLetPatternsIfLetGuard {
pub(crate) count: usize,
}
#[derive(Diagnostic)]
#[diag("unreachable `else` clause")]
#[note("this pattern always matches, so the else clause is unreachable")]
pub(crate) struct IrrefutableLetPatternsLetElse {
#[subdiagnostic]
pub(crate) be_replaced: Option<LetElseReplacementSuggestion>,
}
#[derive(Subdiagnostic, Debug)]
#[suggestion(
"consider using `let {$lhs} = {$rhs}` to match on a specific variant",
code = "let {lhs} = {rhs}",
applicability = "machine-applicable"
)]
pub(crate) struct LetElseReplacementSuggestion {
#[primary_span]
pub(crate) span: Span,
pub(crate) lhs: String,
pub(crate) rhs: String,
}
#[derive(Diagnostic)]
#[diag(
"irrefutable `while let` {$count ->
[one] pattern
*[other] patterns
}"
)]
#[note(
"{$count ->
[one] this pattern
*[other] these patterns
} will always match, so the loop will never exit"
)]
#[help("consider instead using a `loop {\"{\"} ... {\"}\"}` with a `let` inside it")]
pub(crate) struct IrrefutableLetPatternsWhileLet {
pub(crate) count: usize,
}
#[derive(Diagnostic)]
#[diag("borrow of moved value")]
pub(crate) struct BorrowOfMovedValue<'tcx> {
#[primary_span]
#[label("value moved into `{$name}` here")]
#[label(
"move occurs because `{$name}` has type `{$ty}`, which does not implement the `Copy` trait"
)]
pub(crate) binding_span: Span,
#[label("value borrowed here after move")]
pub(crate) conflicts_ref: Vec<Span>,
pub(crate) name: Ident,
pub(crate) ty: Ty<'tcx>,
#[suggestion(
"borrow this binding in the pattern to avoid moving the value",
code = "ref ",
applicability = "machine-applicable"
)]
pub(crate) suggest_borrowing: Option<Span>,
}
#[derive(Diagnostic)]
#[diag("cannot borrow value as mutable more than once at a time")]
pub(crate) struct MultipleMutBorrows {
#[primary_span]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) occurrences: Vec<Conflict>,
}
#[derive(Diagnostic)]
#[diag("cannot borrow value as mutable because it is also borrowed as immutable")]
pub(crate) struct AlreadyBorrowed {
#[primary_span]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) occurrences: Vec<Conflict>,
}
#[derive(Diagnostic)]
#[diag("cannot borrow value as immutable because it is also borrowed as mutable")]
pub(crate) struct AlreadyMutBorrowed {
#[primary_span]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) occurrences: Vec<Conflict>,
}
#[derive(Diagnostic)]
#[diag("cannot move out of value because it is borrowed")]
pub(crate) struct MovedWhileBorrowed {
#[primary_span]
pub(crate) span: Span,
#[subdiagnostic]
pub(crate) occurrences: Vec<Conflict>,
}
#[derive(Subdiagnostic)]
pub(crate) enum Conflict {
#[label("value is mutably borrowed by `{$name}` here")]
Mut {
#[primary_span]
span: Span,
name: Symbol,
},
#[label("value is borrowed by `{$name}` here")]
Ref {
#[primary_span]
span: Span,
name: Symbol,
},
#[label("value is moved into `{$name}` here")]
Moved {
#[primary_span]
span: Span,
name: Symbol,
},
}
#[derive(Diagnostic)]
#[diag("cannot use unions in constant patterns")]
pub(crate) struct UnionPattern {
#[primary_span]
#[label("can't use a `union` here")]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag("constant of non-structural type `{$ty}` in a pattern")]
pub(crate) struct TypeNotStructural<'tcx> {
#[primary_span]
#[label("constant of non-structural type")]
pub(crate) span: Span,
#[label(
"{$is_local ->
*[true] `{$ty}` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
[false] `{$ty}` is not usable in patterns
}"
)]
pub(crate) ty_def_span: Span,
pub(crate) ty: Ty<'tcx>,
#[note(
"the `PartialEq` trait must be derived, manual `impl`s are not sufficient; see \
https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details"
)]
pub(crate) manual_partialeq_impl_span: Option<Span>,
#[note(
"see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details"
)]
pub(crate) manual_partialeq_impl_note: bool,
#[subdiagnostic]
pub(crate) suggestion: Option<SuggestEq<'tcx>>,
pub(crate) is_local: bool,
}
#[derive(Subdiagnostic)]
pub(crate) enum SuggestEq<'tcx> {
#[multipart_suggestion(
"{$manual_partialeq_impl ->
[false] if `{$ty}` manually implemented `PartialEq`, you could add
*[true] add
} a condition to the match arm checking for equality",
applicability = "maybe-incorrect",
style = "verbose"
)]
AddIf {
#[suggestion_part(code = "binding")]
pat_span: Span,
#[suggestion_part(code = " if binding == {name}")]
if_span: Span,
name: String,
ty: Ty<'tcx>,
manual_partialeq_impl: bool,
},
#[multipart_suggestion(
"{$manual_partialeq_impl ->
[false] if `{$ty}` manually implemented `PartialEq`, you could add
*[true] add
} a check for equality to the condition of the match arm",
applicability = "maybe-incorrect",
style = "verbose"
)]
AddToIf {
#[suggestion_part(code = "binding")]
pat_span: Span,
#[suggestion_part(code = " && binding == {name}")]
span: Span,
name: String,
ty: Ty<'tcx>,
manual_partialeq_impl: bool,
},
#[multipart_suggestion(
"{$manual_partialeq_impl ->
[false] if `{$ty}` manually implemented `PartialEq`, you could check
*[true] check
} for equality instead of pattern matching",
applicability = "maybe-incorrect",
style = "verbose"
)]
AddToLetChain {
#[suggestion_part(code = "binding")]
pat_span: Span,
#[suggestion_part(code = " && binding == {name}")]
span: Span,
name: String,
ty: Ty<'tcx>,
manual_partialeq_impl: bool,
},
#[multipart_suggestion(
"{$manual_partialeq_impl ->
[false] if `{$ty}` manually implemented `PartialEq`, you could check
*[true] check
} for equality instead of pattern matching",
applicability = "maybe-incorrect",
style = "verbose"
)]
ReplaceWithEq {
#[suggestion_part(code = "")]
removal: Span,
#[suggestion_part(code = " == ")]
eq: Span,
ty: Ty<'tcx>,
manual_partialeq_impl: bool,
},
#[multipart_suggestion(
"{$manual_partialeq_impl ->
[false] if `{$ty}` manually implemented `PartialEq`, you could check
*[true] check
} for equality instead of pattern matching",
applicability = "maybe-incorrect",
style = "verbose"
)]
ReplaceLetElseWithIf {
#[suggestion_part(code = "if ")]
if_span: Span,
#[suggestion_part(code = " == ")]
eq: Span,
#[suggestion_part(code = " ")]
else_span: Span,
ty: Ty<'tcx>,
manual_partialeq_impl: bool,
},
}
#[derive(Diagnostic)]
#[diag("constant of non-structural type `{$ty}` in a pattern")]
#[note(
"see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details"
)]
pub(crate) struct TypeNotPartialEq<'tcx> {
#[primary_span]
#[label("constant of non-structural type")]
pub(crate) span: Span,
pub(crate) ty: Ty<'tcx>,
}
#[derive(Diagnostic)]
#[diag("{$prefix} `{$non_sm_ty}` cannot be used in patterns")]
pub(crate) struct InvalidPattern<'tcx> {
#[primary_span]
#[label("{$prefix} can't be used in patterns")]
pub(crate) span: Span,
pub(crate) non_sm_ty: Ty<'tcx>,
pub(crate) prefix: String,
}
#[derive(Diagnostic)]
#[diag("cannot use unsized non-slice type `{$non_sm_ty}` in constant patterns")]
pub(crate) struct UnsizedPattern<'tcx> {
#[primary_span]
pub(crate) span: Span,
pub(crate) non_sm_ty: Ty<'tcx>,
}
#[derive(Diagnostic)]
#[diag("cannot use NaN in patterns")]
#[note("NaNs compare inequal to everything, even themselves, so this pattern would never match")]
#[help("try using the `is_nan` method instead")]
pub(crate) struct NaNPattern {
#[primary_span]
#[label("evaluates to `NaN`, which is not allowed in patterns")]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag(
"function pointers and raw pointers not derived from integers in patterns behave unpredictably and should not be relied upon"
)]
#[note("see https://github.com/rust-lang/rust/issues/70861 for details")]
pub(crate) struct PointerPattern {
#[primary_span]
#[label("can't be used in patterns")]
pub(crate) span: Span,
}
#[derive(Diagnostic)]
#[diag("mismatched types")]
#[note("the matched value is of type `{$ty}`")]
pub(crate) struct NonEmptyNeverPattern<'tcx> {
#[primary_span]
#[label("a never pattern must be used on an uninhabited type")]
pub(crate) span: Span,
pub(crate) ty: Ty<'tcx>,
}
#[derive(Diagnostic)]
#[diag("refutable pattern in {$origin}", code = E0005)]
pub(crate) struct PatternNotCovered<'s, 'tcx> {
#[primary_span]
pub(crate) span: Span,
pub(crate) origin: &'s str,
#[subdiagnostic]
pub(crate) uncovered: Uncovered,
#[subdiagnostic]
pub(crate) inform: Option<Inform>,
#[subdiagnostic]
pub(crate) interpreted_as_const: Option<InterpretedAsConst>,
#[subdiagnostic]
pub(crate) interpreted_as_const_sugg: Option<InterpretedAsConstSugg>,
#[subdiagnostic]
pub(crate) adt_defined_here: Option<AdtDefinedHere<'tcx>>,
#[note(
"pattern `{$witness_1}` is currently uninhabited, but this variant contains private fields which may become inhabited in the future"
)]
pub(crate) witness_1_is_privately_uninhabited: bool,
pub(crate) witness_1: String,
#[note("the matched value is of type `{$pattern_ty}`")]
pub(crate) _p: (),
pub(crate) pattern_ty: Ty<'tcx>,
#[subdiagnostic]
pub(crate) let_suggestion: Option<SuggestLet>,
#[subdiagnostic]
pub(crate) misc_suggestion: Option<MiscPatternSuggestion>,
}
#[derive(Subdiagnostic, Debug)]
#[note(
"{$descr} require an \"irrefutable pattern\", like a `struct` or an `enum` with only one variant"
)]
#[note("for more information, visit https://doc.rust-lang.org/book/ch19-02-refutability.html")]
pub(crate) struct Inform {
pub(crate) descr: &'static str,
}
#[derive(Subdiagnostic)]
#[label(
"missing patterns are not covered because `{$variable}` is interpreted as a constant pattern, not a new variable"
)]
pub(crate) struct InterpretedAsConst {
#[primary_span]
pub(crate) span: Span,
pub(crate) variable: String,
}
pub(crate) struct AdtDefinedHere<'tcx> {
pub(crate) adt_def_span: Span,
pub(crate) ty: Ty<'tcx>,
pub(crate) variants: Vec<Variant>,
}
pub(crate) struct Variant {
pub(crate) span: Span,
}
impl<'tcx> Subdiagnostic for AdtDefinedHere<'tcx> {
fn add_to_diag<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
diag.arg("ty", self.ty);
let mut spans = MultiSpan::from(self.adt_def_span);
for Variant { span } in self.variants {
spans.push_span_label(span, msg!("not covered"));
}
diag.span_note(spans, msg!("`{$ty}` defined here"));
}
}
#[derive(Subdiagnostic)]
#[suggestion(
"introduce a variable instead",
code = "{variable}_var",
applicability = "maybe-incorrect",
style = "verbose"
)]
pub(crate) struct InterpretedAsConstSugg {
#[primary_span]
pub(crate) span: Span,
pub(crate) variable: String,
}
#[derive(Subdiagnostic)]
pub(crate) enum SuggestLet {
#[multipart_suggestion(
"you might want to use `if let` to ignore the {$count ->
[one] variant that isn't
*[other] variants that aren't
} matched",
applicability = "has-placeholders"
)]
If {
#[suggestion_part(code = "if ")]
start_span: Span,
#[suggestion_part(code = " {{ todo!() }}")]
semi_span: Span,
count: usize,
},
#[suggestion(
"you might want to use `let...else` to handle the {$count ->
[one] variant that isn't
*[other] variants that aren't
} matched",
// ignore-tidy-todo
code = " else {{ todo!() }}",
applicability = "has-placeholders"
)]
Else {
#[primary_span]
end_span: Span,
count: usize,
},
}
#[derive(Subdiagnostic)]
pub(crate) enum MiscPatternSuggestion {
#[suggestion(
"alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits",
code = "_",
applicability = "maybe-incorrect"
)]
AttemptedIntegerLiteral {
#[primary_span]
start_span: Span,
},
}
#[derive(Diagnostic)]
#[diag("invalid update of the `#[loop_match]` state")]
pub(crate) struct LoopMatchInvalidUpdate {
#[primary_span]
pub lhs: Span,
#[label("the assignment must update this variable")]
pub scrutinee: Span,
}
#[derive(Diagnostic)]
#[diag("invalid match on `#[loop_match]` state")]
#[note("a local variable must be the scrutinee within a `#[loop_match]`")]
pub(crate) struct LoopMatchInvalidMatch {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("this `#[loop_match]` state value has type `{$ty}`, which is not supported")]
#[note("only integers, floats, bool, char, and enums without fields are supported")]
pub(crate) struct LoopMatchUnsupportedType<'tcx> {
#[primary_span]
pub span: Span,
pub ty: Ty<'tcx>,
}
#[derive(Diagnostic)]
#[diag("statements are not allowed in this position within a `#[loop_match]`")]
pub(crate) struct LoopMatchBadStatements {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("this expression must be a single `match` wrapped in a labeled block")]
pub(crate) struct LoopMatchBadRhs {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("expected a single assignment expression")]
pub(crate) struct LoopMatchMissingAssignment {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("match arms that are part of a `#[loop_match]` cannot have guards")]
pub(crate) struct LoopMatchArmWithGuard {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("could not determine the target branch for this `#[const_continue]`")]
#[help("try extracting the expression into a `const` item")]
pub(crate) struct ConstContinueNotMonomorphicConst {
#[primary_span]
pub span: Span,
#[subdiagnostic]
pub reason: ConstContinueNotMonomorphicConstReason,
}
#[derive(Subdiagnostic)]
pub(crate) enum ConstContinueNotMonomorphicConstReason {
#[label("constant parameters may use generics, and are not evaluated early enough")]
ConstantParameter {
#[primary_span]
span: Span,
},
#[label("`const` blocks may use generics, and are not evaluated early enough")]
ConstBlock {
#[primary_span]
span: Span,
},
#[label("this value must be a literal or a monomorphic const")]
Other {
#[primary_span]
span: Span,
},
}
#[derive(Diagnostic)]
#[diag("could not determine the target branch for this `#[const_continue]`")]
pub(crate) struct ConstContinueBadConst {
#[primary_span]
#[label("this value is too generic")]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("a `#[const_continue]` must break to a label with a value")]
pub(crate) struct ConstContinueMissingLabelOrValue {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag("the target of this `#[const_continue]` is not statically known")]
pub(crate) struct ConstContinueUnknownJumpTarget {
#[primary_span]
pub span: Span,
}