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Prevent array length printing cycle with debug assertions

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This commit is contained in:
Oliver Scherer 2019-05-26 17:33:32 +02:00
parent 7385f2177f
commit d1f62b92eb
1 changed files with 6 additions and 1 deletions
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7
src/librustc/ty/print/pretty.rs
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@ -696,7 +696,12 @@ pub trait PrettyPrinter<'tcx>:
},
ty::Array(ty, sz) => {
p!(write("["), print(ty), write("; "));
if let Some(n) = sz.try_eval_usize(self.tcx(), ty::ParamEnv::empty()) {
if let ConstValue::Unevaluated(..) = sz.val {
// do not try to evalute unevaluated constants. If we are const evaluating an
// array length anon const, rustc will (with debug assertions) print the
// constant's path. Which will end up here again.
p!(write("_"));
} else if let Some(n) = sz.try_eval_usize(self.tcx(), ty::ParamEnv::empty()) {
p!(write("{}", n));
} else {
p!(write("_"));