Enum rustc_mir_build::build::BlockFrame

enum BlockFrame {
    Statement {
        ignores_expr_result: bool,
    },
    TailExpr {
        tail_result_is_ignored: bool,
        span: Span,
    },
    SubExpr,
}

Variants

Statement

Fields

ignores_expr_result: bool

If true, then statement discards result from evaluating the expression (such as examples 1 and 2 above).

Evaluation is currently within a statement.

Examples include:

1. EXPR;
2. let _ = EXPR;
3. let x = EXPR;

TailExpr

Fields

tail_result_is_ignored: bool

If true, then the surrounding context of the block ignores the result of evaluating the block’s tail expression.

Example: let _ = { STMT_1; EXPR };

span: Span

Span of the tail expression.

Evaluation is currently within the tail expression of a block.

Example: { STMT_1; STMT_2; EXPR }

SubExpr

Generic mark meaning that the block occurred as a subexpression where the result might be used.

Examples: foo(EXPR), match EXPR { ... }

Implementations

impl BlockFrame

fn is_tail_expr(&self) -> bool

fn is_statement(&self) -> bool

Trait Implementations

impl Debug for BlockFrame

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

Formats the value using the given formatter.

impl PartialEq<BlockFrame> for BlockFrame

fn eq(&self, other: &BlockFrame) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for BlockFrame

impl StructuralEq for BlockFrame

impl StructuralPartialEq for BlockFrame

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: 12 bytes

Size for each variant:

• Statement: 1 byte
• TailExpr: 11 bytes
• SubExpr: 0 bytes