rustc_builtin_macros::deriving::generic

Struct BlockOrExpr

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pub(crate) struct BlockOrExpr(ThinVec<Stmt>, Option<P<Expr>>);
Expand description

The code snippets built up for derived code are sometimes used as blocks (e.g. in a function body) and sometimes used as expressions (e.g. in a match arm). This structure avoids committing to either form until necessary, avoiding the insertion of any unnecessary blocks.

The statements come before the expression.

Tuple Fields§

§0: ThinVec<Stmt>§1: Option<P<Expr>>

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impl BlockOrExpr

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pub(crate) fn new_stmts(stmts: ThinVec<Stmt>) -> BlockOrExpr

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pub(crate) fn new_expr(expr: P<Expr>) -> BlockOrExpr

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pub(crate) fn new_mixed( stmts: ThinVec<Stmt>, expr: Option<P<Expr>>, ) -> BlockOrExpr

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fn into_block(self, cx: &ExtCtxt<'_>, span: Span) -> P<Block>

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fn into_expr(self, cx: &ExtCtxt<'_>, span: Span) -> P<Expr>

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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fn instrument(self, span: Span) -> Instrumented<Self>

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const ALIGN: usize

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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: 16 bytes