Struct syntex_syntax::ext::base::DummyResult

pub struct DummyResult {
    // some fields omitted
}

Fill-in macro expansion result, to allow compilation to continue after hitting errors.

Methods

impl DummyResult

fn any(sp: Span) -> Box<MacResult + 'static>

Create a default MacResult that can be anything.

Use this as a return value after hitting any errors and calling span_err.

fn expr(sp: Span) -> Box<MacResult + 'static>

Create a default MacResult that can only be an expression.

Use this for macros that must expand to an expression, so even if an error is encountered internally, the user will receive an error that they also used it in the wrong place.

fn raw_expr(sp: Span) -> P<Expr>

A plain dummy expression.

fn raw_pat(sp: Span) -> Pat

A plain dummy pattern.

fn raw_ty(sp: Span) -> P<Ty>

Trait Implementations

impl MacResult for DummyResult

fn make_expr(self: Box<DummyResult>) -> Option<P<Expr>>

Create an expression.

fn make_pat(self: Box<DummyResult>) -> Option<P<Pat>>

Create a pattern.

fn make_items(self: Box<DummyResult>) -> Option<SmallVector<P<Item>>>

Create zero or more items.

fn make_impl_items(self: Box<DummyResult>) -> Option<SmallVector<P<ImplItem>>>

Create zero or more impl items.

fn make_stmts(self: Box<DummyResult>) -> Option<SmallVector<P<Stmt>>>

Create zero or more statements.

fn make_ty(self: Box<Self>) -> Option<P<Ty>>

Derived Implementations

impl Clone for DummyResult

fn clone(&self) -> DummyResult

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for DummyResult