From 58d14bcaf70662506e1a289494365d976b40fc4e Mon Sep 17 00:00:00 2001
From: Ville Penttinen <villem.penttinen@gmail.com>
Date: Sun, 17 Feb 2019 22:19:21 +0200
Subject: Enable parsing attributes for generic lifetimes and type parameters

---
 crates/ra_syntax/src/ast/generated.rs       |  2 ++
 crates/ra_syntax/src/grammar.ron            |  7 +++++--
 crates/ra_syntax/src/grammar/type_params.rs | 22 +++++++++++++++-------
 3 files changed, 22 insertions(+), 9 deletions(-)

(limited to 'crates/ra_syntax/src')

diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index c7aaccc95..47107a58b 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -1716,6 +1716,7 @@ impl ToOwned for LifetimeParam {
 }
 
 
+impl ast::AttrsOwner for LifetimeParam {}
 impl LifetimeParam {
     pub fn lifetime(&self) -> Option<&Lifetime> {
         super::child_opt(self)
@@ -4076,6 +4077,7 @@ impl ToOwned for TypeParam {
 
 
 impl ast::NameOwner for TypeParam {}
+impl ast::AttrsOwner for TypeParam {}
 impl TypeParam {}
 
 // TypeParamList
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index 193b563aa..b1775d0f8 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -559,8 +559,11 @@ Grammar(
                 ["lifetime_params", "LifetimeParam" ],
             ]
         ),
-        "TypeParam": ( traits: ["NameOwner"] ),
-        "LifetimeParam": ( options: [ "Lifetime" ] ),
+        "TypeParam": ( traits: ["NameOwner", "AttrsOwner"] ),
+        "LifetimeParam": (
+            options: [ "Lifetime"],
+            traits: ["AttrsOwner"],
+        ),
         "Lifetime": ( traits: ["AstToken"] ),
         "WhereClause": (),
         "ExprStmt": (
diff --git a/crates/ra_syntax/src/grammar/type_params.rs b/crates/ra_syntax/src/grammar/type_params.rs
index 1ec813b3e..40f998682 100644
--- a/crates/ra_syntax/src/grammar/type_params.rs
+++ b/crates/ra_syntax/src/grammar/type_params.rs
@@ -13,10 +13,20 @@ fn type_param_list(p: &mut Parser) {
     p.bump();
 
     while !p.at(EOF) && !p.at(R_ANGLE) {
+        let m = p.start();
+
+        // test generic_lifetime_type_attribute
+        // fn foo<#[derive(Lifetime)] 'a, #[derive(Type)] T>(_: &'a T) {
+        // }
+        attributes::outer_attributes(p);
+
         match p.current() {
-            LIFETIME => lifetime_param(p),
-            IDENT => type_param(p),
-            _ => p.err_and_bump("expected type parameter"),
+            LIFETIME => lifetime_param(p, m),
+            IDENT => type_param(p, m),
+            _ => {
+                m.abandon(p);
+                p.err_and_bump("expected type parameter")
+            }
         }
         if !p.at(R_ANGLE) && !p.expect(COMMA) {
             break;
@@ -26,9 +36,8 @@ fn type_param_list(p: &mut Parser) {
     m.complete(p, TYPE_PARAM_LIST);
 }
 
-fn lifetime_param(p: &mut Parser) {
+fn lifetime_param(p: &mut Parser, m: Marker) {
     assert!(p.at(LIFETIME));
-    let m = p.start();
     p.bump();
     if p.at(COLON) {
         lifetime_bounds(p);
@@ -36,9 +45,8 @@ fn lifetime_param(p: &mut Parser) {
     m.complete(p, LIFETIME_PARAM);
 }
 
-fn type_param(p: &mut Parser) {
+fn type_param(p: &mut Parser, m: Marker) {
     assert!(p.at(IDENT));
-    let m = p.start();
     name(p);
     if p.at(COLON) {
         bounds(p);
-- 
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