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-rw-r--r--src/test/ui/implied-bounds/issue-101951.rs50
1 files changed, 50 insertions, 0 deletions
diff --git a/src/test/ui/implied-bounds/issue-101951.rs b/src/test/ui/implied-bounds/issue-101951.rs
new file mode 100644
index 000000000..108fef8a1
--- /dev/null
+++ b/src/test/ui/implied-bounds/issue-101951.rs
@@ -0,0 +1,50 @@
+// Taken directly from that issue.
+//
+// This test detected that we didn't correctly resolve
+// inference variables when computing implied bounds.
+//
+// check-pass
+pub trait BuilderFn<'a> {
+ type Output;
+}
+
+impl<'a, F, Out> BuilderFn<'a> for F
+where
+ F: FnOnce(&'a mut ()) -> Out,
+{
+ type Output = Out;
+}
+
+pub trait ConstructionFirm {
+ type Builder: for<'a> BuilderFn<'a>;
+}
+
+pub trait Campus<T>
+where
+ T: ConstructionFirm,
+{
+ fn add_building(
+ &mut self,
+ building: &mut <<T as ConstructionFirm>::Builder as BuilderFn<'_>>::Output,
+ );
+}
+
+struct ArchitectsInc {}
+
+impl ConstructionFirm for ArchitectsInc {
+ type Builder = fn(&mut ()) -> PrettyCondo<'_>;
+}
+
+struct PrettyCondo<'a> {
+ _marker: &'a mut (),
+}
+
+struct CondoEstate {}
+
+impl Campus<ArchitectsInc> for CondoEstate {
+ fn add_building(&mut self, _building: &mut PrettyCondo<'_>) {
+ todo!()
+ }
+}
+
+fn main() {}