Struct rustc_builtin_macros::deriving::generic::BlockOrExpr
source · pub 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>>
Implementations§
source§impl BlockOrExpr
impl BlockOrExpr
pub fn new_stmts(stmts: ThinVec<Stmt>) -> BlockOrExpr
pub fn new_expr(expr: P<Expr>) -> BlockOrExpr
pub fn new_mixed(stmts: ThinVec<Stmt>, expr: Option<P<Expr>>) -> BlockOrExpr
fn into_block(self, cx: &ExtCtxt<'_>, span: Span) -> P<Block>
fn into_expr(self, cx: &ExtCtxt<'_>, span: Span) -> P<Expr>
Auto Trait Implementations§
impl !RefUnwindSafe for BlockOrExpr
impl !Send for BlockOrExpr
impl !Sync for BlockOrExpr
impl Unpin for BlockOrExpr
impl !UnwindSafe for BlockOrExpr
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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: 16 bytes