Support universal function call syntax in function calls

crates/ra_syntax/src/grammar/expressions.rs

@@ -305,6 +305,8 @@ fn postfix_expr(
 // fn foo() {
 //     let _ = f();
 //     let _ = f()(1)(1, 2,);
+//     let _ = f(<Foo>::func());
+//     f(<Foo as Trait>::func());
 // }
 fn call_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
     assert!(p.at(L_PAREN));

crates/ra_syntax/src/grammar/expressions/atom.rs

@@ -40,6 +40,7 @@ pub(super) const ATOM_EXPR_FIRST: TokenSet = LITERAL_FIRST.union(token_set![
     L_PAREN,
     L_CURLY,
     L_BRACK,
+    L_ANGLE, // Universal function call syntax
     PIPE,
     MOVE_KW,
     IF_KW,