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>>

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impl BlockOrExpr

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

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

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pub 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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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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