Rollup merge of #142502 - nnethercote:rustdoc-json-GenericArgs, r=aDotInTheVoid

rustdoc_json: improve handling of generic args

This PR fixes some inconsistencies and inefficiencies in how generic args are handled by rustdoc-json-types.

r? `@aDotInTheVoid`

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/rustdoc-json/generic-args.rs b/tests/rustdoc-json/generic-args.rs
new file mode 100644
index 00000000000..0f588820da7
--- /dev/null
+++ b/tests/rustdoc-json/generic-args.rs
@@ -0,0 +1,20 @@
+pub struct MyStruct(u32);
+
+pub trait MyTrait {
+    type MyType;
+    fn my_fn(&self);
+}
+
+impl MyTrait for MyStruct {
+    type MyType = u32;
+    fn my_fn(&self) {}
+}
+
+//@ is "$.index[?(@.name=='my_fn1')].inner.function.sig.inputs[0][1].qualified_path.args" null
+//@ is "$.index[?(@.name=='my_fn1')].inner.function.sig.inputs[0][1].qualified_path.self_type.resolved_path.args" null
+pub fn my_fn1(_: <MyStruct as MyTrait>::MyType) {}
+
+//@ is "$.index[?(@.name=='my_fn2')].inner.function.sig.inputs[0][1].dyn_trait.traits[0].trait.args.angle_bracketed.constraints[0].args" null
+pub fn my_fn2(_: IntoIterator<Item = MyStruct, IntoIter = impl Clone>) {}
+
+fn main() {}