1 files changed, 30 insertions, 0 deletions
diff --git a/tests/rustdoc-json/traits/trait_alias.rs b/tests/rustdoc-json/traits/trait_alias.rs
new file mode 100644
index 000000000..35db9296c
--- /dev/null
+++ b/tests/rustdoc-json/traits/trait_alias.rs
@@ -0,0 +1,30 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/104923>
+// ignore-tidy-linelength
+
+#![feature(trait_alias)]
+
+// @set Orig = "$.index[*][?(@.name == 'Orig')].id"
+// @is "$.index[*][?(@.name == 'Orig')].kind" '"trait"'
+pub trait Orig<T> {}
+
+// @set Alias = "$.index[*][?(@.name == 'Alias')].id"
+// @is "$.index[*][?(@.name == 'Alias')].kind" '"trait_alias"'
+// @is "$.index[*][?(@.name == 'Alias')].inner.generics" '{"params": [], "where_predicates": []}'
+// @count "$.index[*][?(@.name == 'Alias')].inner.params[*]" 1
+// @is "$.index[*][?(@.name == 'Alias')].inner.params[0].trait_bound.trait.id" $Orig
+// @is "$.index[*][?(@.name == 'Alias')].inner.params[0].trait_bound.trait.args.angle_bracketed.args[0].type.inner" '"i32"'
+pub trait Alias = Orig<i32>;
+
+pub struct Struct;
+
+impl Orig<i32> for Struct {}
+
+// @is "$.index[*][?(@.name=='takes_alias')].inner.decl.inputs[0][1].kind" '"impl_trait"'
+// @is "$.index[*][?(@.name=='takes_alias')].inner.decl.inputs[0][1].inner[0].trait_bound.trait.id" $Alias
+// @is "$.index[*][?(@.name=='takes_alias')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.id" $Alias
+pub fn takes_alias(_: impl Alias) {}
+// FIXME: Should the trait be mentioned in both the decl and generics?
+
+fn main() {
+    takes_alias(Struct);
+}