Trait proc_macro_kwargs::parse::MacroArg

pub trait MacroArg: Sized {
    // Required method
    fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>;
}

A type that can be parsed as an argument to a macro.

This is often implemented by delegating to syn’s Parse.

However, sometimes it can behave differently. For example, nested MacroKeywordArgs require surrounding braces {} when parsed as a MacroArg, but not when parsed via syn’s Parse.

This gives the effect of requiring braces when nested (as a MacroArg), but not at the top level (via syn’s Parse).

Required Methods

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

Parse the argument to the macro

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl MacroArg for Meta

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Expr

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for GenericParam

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Lit

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Visibility

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Type

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for bool

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for char

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for f32

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for f64

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for i8

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for i16

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for i32

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for i64

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for isize

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for u8

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for u16

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for u32

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for u64

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for usize

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for String

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Ident

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Lifetime

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for LitBool

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for LitFloat

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for LitInt

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for LitStr

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl MacroArg for Path

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

impl<T: MacroArg> MacroArg for Option<T>

Parses an optional MacroArg, always returning the Some variant

The None variant will only be generated if the argument is missing

fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>

Implementors

impl<K, V> MacroArg for KeyValuePair<K, V>

where K: MacroDictKey, V: MacroArg,

impl<K: MacroKeywordArgs> MacroArg for ParsedKeywordArguments<K>

impl<K: MacroDictKey, V: MacroArg> MacroArg for NestedDict<K, V>

impl<T> MacroArg for Syn<T>

where T: Parse,

impl<T, P> MacroArg for NestedList<T, P>

where T: MacroArg, P: Parse,

impl<T: MacroArg> MacroArg for ExplicitOption<T>