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Fix dead code warning when inline const is used in pattern

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This commit is contained in:
Gary Guo 2021-08-14 21:54:17 +01:00
parent a59e885314
commit 2969aece41
1 changed files with 7 additions and 0 deletions
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7
compiler/rustc_passes/src/dead.rs
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@ -15,6 +15,7 @@ use rustc_middle::middle::privacy;
use rustc_middle::ty::{self, DefIdTree, TyCtxt};
use rustc_session::lint;
use rustc_span::symbol::{sym, Symbol};
use std::mem;
// Any local node that may call something in its body block should be
// explored. For example, if it's a live Node::Item that is a
@ -395,8 +396,14 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> {
}
fn visit_anon_const(&mut self, c: &'tcx hir::AnonConst) {
// When inline const blocks are used in pattern position, paths
// referenced by it should be considered as used.
let in_pat = mem::replace(&mut self.in_pat, false);
self.live_symbols.insert(self.tcx.hir().local_def_id(c.hir_id));
intravisit::walk_anon_const(self, c);
self.in_pat = in_pat;
}
}