Enum rustc_expand::base::SyntaxExtensionKind[][src]

pub enum SyntaxExtensionKind {
    Bang(Box<dyn ProcMacro + Sync + Send>),
    LegacyBang(Box<dyn TTMacroExpander + Sync + Send>),
    Attr(Box<dyn AttrProcMacro + Sync + Send>),
    LegacyAttr(Box<dyn MultiItemModifier + Sync + Send>),
    NonMacroAttr,
    Derive(Box<dyn MultiItemModifier + Sync + Send>),
    LegacyDerive(Box<dyn MultiItemModifier + Sync + Send>),
}
Expand description

A syntax extension kind.

Variants

Bang(Box<dyn ProcMacro + Sync + Send>)

Tuple Fields

0: Box<dyn ProcMacro + Sync + Send>

An expander with signature TokenStream -> TokenStream.

A token-based function-like macro.

LegacyBang(Box<dyn TTMacroExpander + Sync + Send>)

Tuple Fields

0: Box<dyn TTMacroExpander + Sync + Send>

An expander with signature TokenStream -> AST.

An AST-based function-like macro.

Attr(Box<dyn AttrProcMacro + Sync + Send>)

Tuple Fields

0: Box<dyn AttrProcMacro + Sync + Send>

An expander with signature (TokenStream, TokenStream) -> TokenStream. The first TokenSteam is the attribute itself, the second is the annotated item. The produced TokenSteam replaces the input TokenSteam.

A token-based attribute macro.

LegacyAttr(Box<dyn MultiItemModifier + Sync + Send>)

Tuple Fields

0: Box<dyn MultiItemModifier + Sync + Send>

An expander with signature (AST, AST) -> AST. The first AST fragment is the attribute itself, the second is the annotated item. The produced AST fragment replaces the input AST fragment.

An AST-based attribute macro.

NonMacroAttr

A trivial attribute “macro” that does nothing, only keeps the attribute and marks it as inert, thus making it ineligible for further expansion.

Derive(Box<dyn MultiItemModifier + Sync + Send>)

Tuple Fields

0: Box<dyn MultiItemModifier + Sync + Send>

An expander with signature TokenStream -> TokenStream (not yet). The produced TokenSteam is appended to the input TokenSteam.

A token-based derive macro.

LegacyDerive(Box<dyn MultiItemModifier + Sync + Send>)

Tuple Fields

0: Box<dyn MultiItemModifier + Sync + Send>

An expander with signature AST -> AST. The produced AST fragment is appended to the input AST fragment.

An AST-based derive macro.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes

Size for each variant: