#![allow(
clippy::assertions_on_result_states,
clippy::manual_let_else,
clippy::too_many_lines,
clippy::uninlined_format_args
)]
#[macro_use]
mod macros;
use quote::quote;
use syn::{Data, DeriveInput};
#[test]
fn test_unit() {
let input = quote! {
struct Unit;
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Inherited,
ident: "Unit",
generics: Generics,
data: Data::Struct {
fields: Fields::Unit,
semi_token: Some,
},
}
"###);
}
#[test]
fn test_struct() {
let input = quote! {
#[derive(Debug, Clone)]
pub struct Item {
pub ident: Ident,
pub attrs: Vec<Attribute>
}
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
attrs: [
Attribute {
style: AttrStyle::Outer,
meta: Meta::List {
path: Path {
segments: [
PathSegment {
ident: "derive",
},
],
},
delimiter: MacroDelimiter::Paren,
tokens: TokenStream(`Debug , Clone`),
},
},
],
vis: Visibility::Public,
ident: "Item",
generics: Generics,
data: Data::Struct {
fields: Fields::Named {
named: [
Field {
vis: Visibility::Public,
ident: Some("ident"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "Ident",
},
],
},
},
},
Field {
vis: Visibility::Public,
ident: Some("attrs"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "Vec",
arguments: PathArguments::AngleBracketed {
args: [
GenericArgument::Type(Type::Path {
path: Path {
segments: [
PathSegment {
ident: "Attribute",
},
],
},
}),
],
},
},
],
},
},
},
],
},
},
}
"###);
snapshot!(&input.attrs[0].meta, @r###"
Meta::List {
path: Path {
segments: [
PathSegment {
ident: "derive",
},
],
},
delimiter: MacroDelimiter::Paren,
tokens: TokenStream(`Debug , Clone`),
}
"###);
}
#[test]
fn test_union() {
let input = quote! {
union MaybeUninit<T> {
uninit: (),
value: T
}
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Inherited,
ident: "MaybeUninit",
generics: Generics {
lt_token: Some,
params: [
GenericParam::Type(TypeParam {
ident: "T",
}),
],
gt_token: Some,
},
data: Data::Union {
fields: FieldsNamed {
named: [
Field {
vis: Visibility::Inherited,
ident: Some("uninit"),
colon_token: Some,
ty: Type::Tuple,
},
Field {
vis: Visibility::Inherited,
ident: Some("value"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "T",
},
],
},
},
},
],
},
},
}
"###);
}
#[test]
#[cfg(feature = "full")]
fn test_enum() {
let input = quote! {
/// See the std::result module documentation for details.
#[must_use]
pub enum Result<T, E> {
Ok(T),
Err(E),
Surprise = 0isize,
// Smuggling data into a proc_macro_derive,
// in the style of https://github.com/dtolnay/proc-macro-hack
ProcMacroHack = (0, "data").0
}
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
attrs: [
Attribute {
style: AttrStyle::Outer,
meta: Meta::NameValue {
path: Path {
segments: [
PathSegment {
ident: "doc",
},
],
},
value: Expr::Lit {
lit: " See the std::result module documentation for details.",
},
},
},
Attribute {
style: AttrStyle::Outer,
meta: Meta::Path {
segments: [
PathSegment {
ident: "must_use",
},
],
},
},
],
vis: Visibility::Public,
ident: "Result",
generics: Generics {
lt_token: Some,
params: [
GenericParam::Type(TypeParam {
ident: "T",
}),
GenericParam::Type(TypeParam {
ident: "E",
}),
],
gt_token: Some,
},
data: Data::Enum {
variants: [
Variant {
ident: "Ok",
fields: Fields::Unnamed {
unnamed: [
Field {
vis: Visibility::Inherited,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "T",
},
],
},
},
},
],
},
},
Variant {
ident: "Err",
fields: Fields::Unnamed {
unnamed: [
Field {
vis: Visibility::Inherited,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "E",
},
],
},
},
},
],
},
},
Variant {
ident: "Surprise",
fields: Fields::Unit,
discriminant: Some(Expr::Lit {
lit: 0isize,
}),
},
Variant {
ident: "ProcMacroHack",
fields: Fields::Unit,
discriminant: Some(Expr::Field {
base: Expr::Tuple {
elems: [
Expr::Lit {
lit: 0,
},
Expr::Lit {
lit: "data",
},
],
},
member: Member::Unnamed(Index {
index: 0,
}),
}),
},
],
},
}
"###);
let meta_items: Vec<_> = input.attrs.into_iter().map(|attr| attr.meta).collect();
snapshot!(meta_items, @r###"
[
Meta::NameValue {
path: Path {
segments: [
PathSegment {
ident: "doc",
},
],
},
value: Expr::Lit {
lit: " See the std::result module documentation for details.",
},
},
Meta::Path {
segments: [
PathSegment {
ident: "must_use",
},
],
},
]
"###);
}
#[test]
fn test_attr_with_non_mod_style_path() {
let input = quote! {
#[inert <T>]
struct S;
};
syn::parse2::<DeriveInput>(input).unwrap_err();
}
#[test]
fn test_attr_with_mod_style_path_with_self() {
let input = quote! {
#[foo::self]
struct S;
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
attrs: [
Attribute {
style: AttrStyle::Outer,
meta: Meta::Path {
segments: [
PathSegment {
ident: "foo",
},
PathSegment {
ident: "self",
},
],
},
},
],
vis: Visibility::Inherited,
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unit,
semi_token: Some,
},
}
"###);
snapshot!(&input.attrs[0].meta, @r###"
Meta::Path {
segments: [
PathSegment {
ident: "foo",
},
PathSegment {
ident: "self",
},
],
}
"###);
}
#[test]
fn test_pub_restricted() {
// Taken from tests/rust/src/test/ui/resolve/auxiliary/privacy-struct-ctor.rs
let input = quote! {
pub(in m) struct Z(pub(in m::n) u8);
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Restricted {
in_token: Some,
path: Path {
segments: [
PathSegment {
ident: "m",
},
],
},
},
ident: "Z",
generics: Generics,
data: Data::Struct {
fields: Fields::Unnamed {
unnamed: [
Field {
vis: Visibility::Restricted {
in_token: Some,
path: Path {
segments: [
PathSegment {
ident: "m",
},
PathSegment {
ident: "n",
},
],
},
},
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "u8",
},
],
},
},
},
],
},
semi_token: Some,
},
}
"###);
}
#[test]
fn test_pub_restricted_crate() {
let input = quote! {
pub(crate) struct S;
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Restricted {
path: Path {
segments: [
PathSegment {
ident: "crate",
},
],
},
},
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unit,
semi_token: Some,
},
}
"###);
}
#[test]
fn test_pub_restricted_super() {
let input = quote! {
pub(super) struct S;
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Restricted {
path: Path {
segments: [
PathSegment {
ident: "super",
},
],
},
},
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unit,
semi_token: Some,
},
}
"###);
}
#[test]
fn test_pub_restricted_in_super() {
let input = quote! {
pub(in super) struct S;
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Restricted {
in_token: Some,
path: Path {
segments: [
PathSegment {
ident: "super",
},
],
},
},
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unit,
semi_token: Some,
},
}
"###);
}
#[test]
fn test_fields_on_unit_struct() {
let input = quote! {
struct S;
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Inherited,
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unit,
semi_token: Some,
},
}
"###);
let data = match input.data {
Data::Struct(data) => data,
_ => panic!("expected a struct"),
};
assert_eq!(0, data.fields.iter().count());
}
#[test]
fn test_fields_on_named_struct() {
let input = quote! {
struct S {
foo: i32,
pub bar: String,
}
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Inherited,
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Named {
named: [
Field {
vis: Visibility::Inherited,
ident: Some("foo"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "i32",
},
],
},
},
},
Field {
vis: Visibility::Public,
ident: Some("bar"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "String",
},
],
},
},
},
],
},
},
}
"###);
let data = match input.data {
Data::Struct(data) => data,
_ => panic!("expected a struct"),
};
snapshot!(data.fields.into_iter().collect::<Vec<_>>(), @r###"
[
Field {
vis: Visibility::Inherited,
ident: Some("foo"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "i32",
},
],
},
},
},
Field {
vis: Visibility::Public,
ident: Some("bar"),
colon_token: Some,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "String",
},
],
},
},
},
]
"###);
}
#[test]
fn test_fields_on_tuple_struct() {
let input = quote! {
struct S(i32, pub String);
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Inherited,
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unnamed {
unnamed: [
Field {
vis: Visibility::Inherited,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "i32",
},
],
},
},
},
Field {
vis: Visibility::Public,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "String",
},
],
},
},
},
],
},
semi_token: Some,
},
}
"###);
let data = match input.data {
Data::Struct(data) => data,
_ => panic!("expected a struct"),
};
snapshot!(data.fields.iter().collect::<Vec<_>>(), @r###"
[
Field {
vis: Visibility::Inherited,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "i32",
},
],
},
},
},
Field {
vis: Visibility::Public,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "String",
},
],
},
},
},
]
"###);
}
#[test]
fn test_ambiguous_crate() {
let input = quote! {
// The field type is `(crate::X)` not `crate (::X)`.
struct S(crate::X);
};
snapshot!(input as DeriveInput, @r###"
DeriveInput {
vis: Visibility::Inherited,
ident: "S",
generics: Generics,
data: Data::Struct {
fields: Fields::Unnamed {
unnamed: [
Field {
vis: Visibility::Inherited,
ty: Type::Path {
path: Path {
segments: [
PathSegment {
ident: "crate",
},
PathSegment {
ident: "X",
},
],
},
},
},
],
},
semi_token: Some,
},
}
"###);
}