Struct BlockContext

struct BlockContext(Vec<BlockFrame>);

Tuple Fields

0: Vec<BlockFrame>

Implementations

impl BlockContext

fn new() -> Self

fn push(&mut self, bf: BlockFrame)

fn pop(&mut self) -> Option<BlockFrame>

fn currently_in_block_tail(&self) -> Option<BlockTailInfo>

Traverses the frames on the BlockContext, searching for either the first block-tail expression frame with no intervening statement frame.

Notably, this skips over SubExpr frames; this method is meant to be used in the context of understanding the relationship of a temp (created within some complicated expression) with its containing expression, and whether the value of that containing expression (not the temp!) is ignored.

fn currently_ignores_tail_results(&self) -> bool

Looks at the topmost frame on the BlockContext and reports whether its one that would discard a block tail result.

Unlike currently_within_ignored_tail_expression, this does not skip over SubExpr frames: here, we want to know whether the block result itself is discarded.

Trait Implementations

impl Debug for BlockContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

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