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,
    ArgValueMustBeExpr,
    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

Fields

attr: String

Attribute name

arg: String

Argument name

Attribute has an unknown argument

ArgTypeProhibited

Fields

attr: String

Attribute name

arg: String

Argument name

Attribute is not allowed to have argument of type arg

ArgNumberExceedsMax

Fields

attr: String

Attribute name

type_name: String

Argument type name

no: usize

Number of arguments

max_no: u8

Maximum allowed number of arguments

Number of arg arguments in attribute attr exceeds maximum

ArgMustNotHaveValue

Fields

attr: String

Attribute name

arg: String

Argument name

Attribute argument arg must not have a value

ArgRequired

Fields

attr: String

Attribute name

arg: String

Argument name

Attribute must has an arg argument

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

Fields

attr: String

Attribute name

arg: String

Argument name

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

ArgValueRequired

Fields

attr: String

Attribute name

arg: String

Argument name

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

ArgValueTypeMismatch

Fields

attr: String

Attribute name

arg: String

Argument name

Attribute value type mismatch

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]

ArgValueMustBeExpr

Parametrized attribute argument must be a valid rust expression: #[attr(arg = 2 + 2)] or #[arg = { u16::MAX as usize }]

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 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

fn provide<'a>(&'a self, demand: &mut Demand<'a>)

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

Provides type based access to context intended for error reports.

impl From<Error> for Error

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Infallible> for Error

fn from(_: Infallible) -> Self

Converts to this type from the input type.