8000 Fix double panic when printing query stack during an ICE by Aaron1011 · Pull Request #64799 · rust-lang/rust · GitHub
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Fix double panic when printing query stack during an ICE #64799

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Merged
merged 2 commits into from
Sep 29, 2019
Merged

Fix double panic when printing query stack during an ICE #64799

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e9aa0e7
Use existing Handler to print query stack
Aaron1011 Sep 26, 2019
97906bc
Add note about global state in try_print_query_stack
Aaron1011 Sep 26, 2019
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Add note about global state in try_print_query_stack
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@Aaron1011
Aaron1011 authored Sep 26, 2019
commit 97906bcd5c9c5ba5d165c7330b2ee062a97f11cf
3 changes: 3 additions & 0 deletions src/librustc/ty/query/plumbing.rs
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Expand Up @@ -325,6 +325,9 @@ impl<'tcx> TyCtxt<'tcx> {
pub fn try_print_query_stack(handler: &Handler) {
eprintln!("query stack during panic:");

// Be careful reyling on global state here: this code is called from
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// Be careful reyling on global state here: this code is called from
// Be careful relying on global state here: this code is called from

// a panic hook, which means that the global `Handler` may be in a weird
// state if it was responsible for triggering the panic.
tls::with_context_opt(|icx| {
if let Some(icx) = icx {
let mut current_query = icx.query.clone();
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