Enum amplify_syn::Error

pub enum Error {
    Parse(Error),
    NamesDontMatch(String, String),
    MultipleSingularValues(String),
    MultipleLiteralValues(String),
    UnsupportedLiteral(String),
    SingularAttrRequired(String),
    ParametrizedAttrRequired(String),
    AttributeUnknownArgument {
        attr: String,
        arg: String,
    },
    ArgTypeProhibited {
        attr: String,
        arg: String,
    },
    ArgNumberExceedsMax {
        attr: String,
        type_name: String,
        no: usize,
        max_no: u8,
    },
    ArgMustNotHaveValue {
        attr: String,
        arg: String,
    },
    ArgRequired {
        attr: String,
        arg: String,
    },
    ArgNameMustBeIdent,
    ArgNameMustBeUnique {
        attr: String,
        arg: String,
    },
    ArgValueRequired {
        attr: String,
        arg: String,
    },
    ArgValueTypeMismatch {
        attr: String,
        arg: String,
    },
    ArgValueMustBeLiteral,
    ArgValueMustBeType,
    ParametrizedAttrHasNoValue(String),
    NestedListsNotSupported(String),
}

Errors representing inconsistency in proc macro attribute structure

Variants

Parse(Error)

Parse error from a syn crate

NamesDontMatch(String, String)

Names of two merged attributes must match each other

MultipleSingularValues(String)

Singular argument (of form #[attr = ...]) has multiple occurrences each assigned value. This is meaningless.

MultipleLiteralValues(String)

Multiple literal non-string values are given for a parametrized attribute in form of #[attr(literal1, literal2)]. This is meaningless.

UnsupportedLiteral(String)

Attribute contains unsupported literal argument

SingularAttrRequired(String)

Attribute must be in a singular form (#[attr] or #[attr = ...])

ParametrizedAttrRequired(String)

Attribute must be in a parametrized form (#[attr(...)])

AttributeUnknownArgument

Attribute has an unknown argument

Fields of AttributeUnknownArgument

attr: String

Attribute name

arg: String

Argument name

ArgTypeProhibited

Attribute is not allowed to have argument of type arg

Fields of ArgTypeProhibited

attr: String

Attribute name

arg: String

Argument name

ArgNumberExceedsMax

Number of arg arguments in attribute attr exceeds maximum

Fields of ArgNumberExceedsMax

attr: String

Attribute name

type_name: String

Argument type name

no: usize

Number of arguments

max_no: u8

Maximum allowed number of arguments

ArgMustNotHaveValue

Attribute argument arg must not have a value

Fields of ArgMustNotHaveValue

attr: String

Attribute name

arg: String

Argument name

ArgRequired

Attribute must has an arg argument

Fields of ArgRequired

attr: String

Attribute name

arg: String

Argument name

ArgNameMustBeIdent

Attribute or attribute argument name (in form of #[attr(arg = ...)]) must be an identifier (like arg) and not a path (like std::io)

ArgNameMustBeUnique

The same argument name is used multiple times within parametrized attribute (like in #[attr(name1 = value1, name1 = value2)])

Fields of ArgNameMustBeUnique

attr: String

Attribute name

arg: String

Argument name

ArgValueRequired

Attribute or attribute argument must has a value: #[attr(arg = value)]

Fields of ArgValueRequired

attr: String

Attribute name

arg: String

Argument name

ArgValueTypeMismatch

Attribute value type mismatch

Fields of ArgValueTypeMismatch

attr: String

Attribute name

arg: String

Argument name

ArgValueMustBeLiteral

Parametrized attribute argument must have a literal value (string, integer etc): #[attr(arg = "value")] or #[arg = 4]

ArgValueMustBeType

Parametrized attribute argument must be a valid type name: #[attr(arg = u8)] or #[arg = String]

ParametrizedAttrHasNoValue(String)

Parametrized attribute (in form of #[attr(...)]) does not have a single value

NestedListsNotSupported(String)

👎 Deprecated since 1.1.0:

This error variant is not used anymore after the introduction of custom attribute parser

Lists nested within attribute arguments, like #[attr(arg(...))] are not supported

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Error

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Error

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for Error

fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

🔬 This is a nightly-only experimental API. (backtrace)

Returns a stack backtrace, if available, of where this error occurred.

fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl From<Error> for Error

fn from(err: Error) -> Self

Performs the conversion.

impl From<Infallible> for Error

fn from(_: Infallible) -> Self

Performs the conversion.