Add test for overflow when finding auto-trait impls in Rustdoc

Author: Aaron1011

src/test/rustdoc/synthetic_auto/overflow.rs

@@ -0,0 +1,35 @@
+// Tests that we don't fail with an overflow error for certain
+// strange types
+// See https://github.com/rust-lang/rust/pull/72936#issuecomment-643676915
+
+pub trait Interner {
+    type InternedType;
+}
+
+struct RustInterner<'tcx> {
+    foo: &'tcx ()
+}
+
+impl<'tcx> Interner for RustInterner<'tcx> {
+    type InternedType = Box<TyData<Self>>;
+}
+
+enum TyData<I: Interner> {
+    FnDef(I::InternedType)
+}
+
+struct VariableKind<I: Interner>(I::InternedType);
+
+// @has overflow/struct.BoundVarsCollector.html
+// @has - '//code' "impl<'tcx> Send for BoundVarsCollector<'tcx>"
+pub struct BoundVarsCollector<'tcx> {
+    val: VariableKind<RustInterner<'tcx>>
+}
+
+fn is_send<T: Send>() {}
+
+struct MyInterner<'tcx> {
+    val: &'tcx ()
+}
+
+fn main() {}