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Remove ScopeDepth from var_parent.

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It was never used.
This commit is contained in:
Mara Bos 2025-03-26 17:13:49 +01:00
parent 0ad0142a5b
commit 2cc3fa32ef
1 changed files with 16 additions and 10 deletions
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26
compiler/rustc_hir_analysis/src/check/region.rs
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@ -25,12 +25,18 @@ use tracing::debug;
struct Context {
/// The scope that contains any new variables declared, plus its depth in
/// the scope tree.
var_parent: Option<(Scope, ScopeDepth)>,
var_parent: Option<Scope>,
/// Region parent of expressions, etc., plus its depth in the scope tree.
parent: Option<(Scope, ScopeDepth)>,
}
impl Context {
fn set_var_parent(&mut self) {
self.var_parent = self.parent.map(|(p, _)| p);
}
}
struct ScopeResolutionVisitor<'tcx> {
tcx: TyCtxt<'tcx>,
@ -78,7 +84,7 @@ fn record_var_lifetime(visitor: &mut ScopeResolutionVisitor<'_>, var_id: hir::It
//
// extern fn isalnum(c: c_int) -> c_int
}
Some((parent_scope, _)) => visitor.scope_tree.record_var_scope(var_id, parent_scope),
Some(parent_scope) => visitor.scope_tree.record_var_scope(var_id, parent_scope),
}
}
@ -113,7 +119,7 @@ fn resolve_block<'tcx>(visitor: &mut ScopeResolutionVisitor<'tcx>, blk: &'tcx hi
// itself has returned.
visitor.enter_node_scope_with_dtor(blk.hir_id.local_id);
visitor.cx.var_parent = visitor.cx.parent;
visitor.cx.set_var_parent();
{
// This block should be kept approximately in sync with
@ -132,7 +138,7 @@ fn resolve_block<'tcx>(visitor: &mut ScopeResolutionVisitor<'tcx>, blk: &'tcx hi
local_id: blk.hir_id.local_id,
data: ScopeData::Remainder(FirstStatementIndex::new(i)),
});
visitor.cx.var_parent = visitor.cx.parent;
visitor.cx.set_var_parent();
visitor.visit_stmt(statement);
// We need to back out temporarily to the last enclosing scope
// for the `else` block, so that even the temporaries receiving
@ -157,7 +163,7 @@ fn resolve_block<'tcx>(visitor: &mut ScopeResolutionVisitor<'tcx>, blk: &'tcx hi
local_id: blk.hir_id.local_id,
data: ScopeData::Remainder(FirstStatementIndex::new(i)),
});
visitor.cx.var_parent = visitor.cx.parent;
visitor.cx.set_var_parent();
visitor.visit_stmt(statement)
}
hir::StmtKind::Item(..) => {
@ -207,7 +213,7 @@ fn resolve_arm<'tcx>(visitor: &mut ScopeResolutionVisitor<'tcx>, arm: &'tcx hir:
visitor.terminating_scopes.insert(arm.hir_id.local_id);
visitor.enter_node_scope_with_dtor(arm.hir_id.local_id);
visitor.cx.var_parent = visitor.cx.parent;
visitor.cx.set_var_parent();
if let Some(expr) = arm.guard
&& !has_let_expr(expr)
@ -484,7 +490,7 @@ fn resolve_expr<'tcx>(visitor: &mut ScopeResolutionVisitor<'tcx>, expr: &'tcx hi
ScopeData::IfThen
};
visitor.enter_scope(Scope { local_id: then.hir_id.local_id, data });
visitor.cx.var_parent = visitor.cx.parent;
visitor.cx.set_var_parent();
visitor.visit_expr(cond);
visitor.visit_expr(then);
visitor.cx = expr_cx;
@ -499,7 +505,7 @@ fn resolve_expr<'tcx>(visitor: &mut ScopeResolutionVisitor<'tcx>, expr: &'tcx hi
ScopeData::IfThen
};
visitor.enter_scope(Scope { local_id: then.hir_id.local_id, data });
visitor.cx.var_parent = visitor.cx.parent;
visitor.cx.set_var_parent();
visitor.visit_expr(cond);
visitor.visit_expr(then);
visitor.cx = expr_cx;
@ -558,7 +564,7 @@ fn resolve_local<'tcx>(
) {
debug!("resolve_local(pat={:?}, init={:?})", pat, init);
let blk_scope = visitor.cx.var_parent.map(|(p, _)| p);
let blk_scope = visitor.cx.var_parent;
// As an exception to the normal rules governing temporary
// lifetimes, initializers in a let have a temporary lifetime
@ -849,7 +855,7 @@ impl<'tcx> Visitor<'tcx> for ScopeResolutionVisitor<'tcx> {
self.enter_body(body.value.hir_id, |this| {
if this.tcx.hir_body_owner_kind(owner_id).is_fn_or_closure() {
// The arguments and `self` are parented to the fn.
this.cx.var_parent = this.cx.parent;
this.cx.set_var_parent();
for param in body.params {
this.visit_pat(param.pat);
}