Allow attributes before function arguments

This adds support for function calls of the form:

```rust
  (
    #[attr(...)] 1.2,
    #[attr_one(...)]
    #[attr_two(...)]
    1.5,
    ... etc ...
  )
```

Closes https://github.com/rust-analyzer/rust-analyzer/issues/2801

1 files changed, 11 insertions, 0 deletions

diff --git a/crates/ra_parser/src/grammar/expressions.rs b/crates/ra_parser/src/grammar/expressions.rs
index 81d4f75f9..7caed66a0 100644
--- a/crates/ra_parser/src/grammar/expressions.rs
+++ b/crates/ra_parser/src/grammar/expressions.rs
@@ -535,11 +535,22 @@ fn cast_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
     m.complete(p, CAST_EXPR)
 }
 
+// test arg_list
+// fn assert_float(s: &str, n: f64) {}
+// fn foo() {
+//     assert_float(
+//         "1.797693134862315708e+308L",
+//         #[allow(clippy::excessive_precision)]
+//         #[allow(dead_code)]
+//         1.797_693_134_862_315_730_8e+308,
+//     );
+// }
 fn arg_list(p: &mut Parser) {
     assert!(p.at(T!['(']));
     let m = p.start();
     p.bump(T!['(']);
     while !p.at(T![')']) && !p.at(EOF) {
+        attributes::outer_attributes(p);
         if !p.at_ts(EXPR_FIRST) {
             p.error("expected expression");
             break;