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Erase regions before uninhabited check

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This commit is contained in:
Michael Goulet 2023-01-31 20:43:18 +00:00
parent dc1d9d50fb
commit 2c23c7f0cd
2 changed files with 22 additions and 1 deletions
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5
compiler/rustc_borrowck/src/type_check/mod.rs
View File

@ -1484,7 +1484,10 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}
None => {
if !sig.output().is_privately_uninhabited(self.tcx(), self.param_env) {
// The signature in this call can reference region variables,
// so erase them before calling a query.
let output_ty = self.tcx().erase_regions(sig.output());
if !output_ty.is_privately_uninhabited(self.tcx(), self.param_env) {
span_mirbug!(self, term, "call to converging function {:?} w/o dest", sig);
}
}

18
tests/ui/uninhabited/issue-107505.rs Normal file
View File

@ -0,0 +1,18 @@
// compile-flags: --crate-type=lib
// check-pass
// Make sure we don't pass inference variables to uninhabitedness checks in borrowck
struct Command<'s> {
session: &'s (),
imp: std::convert::Infallible,
}
fn command(_: &()) -> Command<'_> {
unreachable!()
}
fn with_session<'s>(a: &std::process::Command, b: &'s ()) -> Command<'s> {
a.get_program();
command(b)
}