SCIP: Qualify parameters by the containing function

SCIP requires symbols to be unique, but multiple functions may have a
parameter with the same name. Qualify parameters according to the
containing function.

crates/rust-analyzer/src/cli/scip.rs

@@ -416,6 +416,44 @@ pub mod module {
         );
     }
 
+    #[test]
+    fn symbol_for_param() {
+        check_symbol(
+            r#"
+//- /lib.rs crate:main deps:foo
+use foo::example_mod::func;
+fn main() {
+    func(42);
+}
+//- /foo/lib.rs crate:foo@0.1.0,https://a.b/foo.git library
+pub mod example_mod {
+    pub fn func(x$0: usize) {}
+}
+"#,
+            "rust-analyzer cargo foo 0.1.0 example_mod/func().(x)",
+        );
+    }
+
+    #[test]
+    fn symbol_for_closure_param() {
+        check_symbol(
+            r#"
+//- /lib.rs crate:main deps:foo
+use foo::example_mod::func;
+fn main() {
+    func();
+}
+//- /foo/lib.rs crate:foo@0.1.0,https://a.b/foo.git library
+pub mod example_mod {
+    pub fn func() {
+        let f = |x$0: usize| {};
+    }
+}
+"#,
+            "rust-analyzer cargo foo 0.1.0 example_mod/func().(x)",
+        );
+    }
+
     #[test]
     fn local_symbol_for_local() {
         check_symbol(