Trait rustc_mir::hair::Mirror

pub trait Mirror<'tcx> {
    type Output;
    fn make_mirror<'a, 'gcx>(self, cx: &mut Cx<'a, 'gcx, 'tcx>) -> Self::Output;
}

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"Mirroring" is the process of converting from a HIR type into one of the HAIR types defined in this file. This is basically a "on the fly" desugaring step that hides a lot of the messiness in the tcx. For example, the mirror of a &'tcx hir::Expr is an Expr<'tcx>.

Mirroring is gradual: when you mirror an outer expression like `e1

• e2, the references to the inner expressionse1ande2areExprRef<'tcx>` instances, and they may or may not be eagerly mirrored. This allows a single AST node from the compiler to expand into one or more Hair nodes, which lets the Hair nodes be simpler.

Associated Types

type Output

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Required Methods

fn make_mirror<'a, 'gcx>(self, cx: &mut Cx<'a, 'gcx, 'tcx>) -> Self::Output

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Implementations on Foreign Types

impl<'tcx> Mirror<'tcx> for &'tcx Block

type Output = Block<'tcx>

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fn make_mirror<'a, 'gcx>(self, cx: &mut Cx<'a, 'gcx, 'tcx>) -> Block<'tcx>

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impl<'tcx> Mirror<'tcx> for &'tcx Expr

type Output = Expr<'tcx>

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fn make_mirror<'a, 'gcx>(self, cx: &mut Cx<'a, 'gcx, 'tcx>) -> Expr<'tcx>

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Implementors

impl<'tcx> Mirror<'tcx> for ExprRef<'tcx>

type Output = Expr<'tcx>

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fn make_mirror<'a, 'gcx>(self, hir: &mut Cx<'a, 'gcx, 'tcx>) -> Expr<'tcx>

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impl<'tcx> Mirror<'tcx> for StmtRef<'tcx>

type Output = Stmt<'tcx>

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fn make_mirror<'a, 'gcx>(self, _: &mut Cx<'a, 'gcx, 'tcx>) -> Stmt<'tcx>

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impl<'tcx> Mirror<'tcx> for rustc_mir::hair::Block<'tcx>

type Output = Block<'tcx>

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fn make_mirror<'a, 'gcx>(self, _: &mut Cx<'a, 'gcx, 'tcx>) -> Block<'tcx>

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impl<'tcx> Mirror<'tcx> for rustc_mir::hair::Expr<'tcx>

type Output = Expr<'tcx>

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fn make_mirror<'a, 'gcx>(self, _: &mut Cx<'a, 'gcx, 'tcx>) -> Expr<'tcx>

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impl<'tcx> Mirror<'tcx> for Stmt<'tcx>

type Output = Stmt<'tcx>

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fn make_mirror<'a, 'gcx>(self, _: &mut Cx<'a, 'gcx, 'tcx>) -> Stmt<'tcx>

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?