From 90122542b2708a4dde36758d1ff5848764858ac0 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 4 Mar 2019 17:47:02 +0300
Subject: allow `mut ident` patterns in trait methods

closes #928
---
 crates/ra_parser/src/grammar/params.rs             |  3 +-
 .../ok/0116_trait_fn_placeholder_parameter.rs      |  2 +-
 .../ok/0116_trait_fn_placeholder_parameter.txt     | 35 +++++++++++++++-------
 3 files changed, 28 insertions(+), 12 deletions(-)

diff --git a/crates/ra_parser/src/grammar/params.rs b/crates/ra_parser/src/grammar/params.rs
index a70f067f9..d027578b6 100644
--- a/crates/ra_parser/src/grammar/params.rs
+++ b/crates/ra_parser/src/grammar/params.rs
@@ -83,9 +83,10 @@ fn value_parameter(p: &mut Parser, flavor: Flavor) {
 
             // test trait_fn_placeholder_parameter
             // trait Foo {
-            //     fn bar(_: u64);
+            //     fn bar(_: u64, mut x: i32);
             // }
             if (la0 == IDENT || la0 == UNDERSCORE) && la1 == COLON
+                || la0 == MUT_KW && la1 == IDENT && la2 == COLON
                 || la0 == AMP && la1 == IDENT && la2 == COLON
                 || la0 == AMP && la1 == MUT_KW && la2 == IDENT && la3 == COLON
             {
diff --git a/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.rs b/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.rs
index aede3f4fe..472cb8803 100644
--- a/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.rs
+++ b/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.rs
@@ -1,3 +1,3 @@
 trait Foo {
-    fn bar(_: u64);
+    fn bar(_: u64, mut x: i32);
 }
diff --git a/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.txt b/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.txt
index 248d491df..00217aef1 100644
--- a/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.txt
+++ b/crates/ra_syntax/tests/data/parser/inline/ok/0116_trait_fn_placeholder_parameter.txt
@@ -1,19 +1,19 @@
-SOURCE_FILE@[0; 34)
-  TRAIT_DEF@[0; 33)
+SOURCE_FILE@[0; 46)
+  TRAIT_DEF@[0; 45)
     TRAIT_KW@[0; 5)
     WHITESPACE@[5; 6)
     NAME@[6; 9)
       IDENT@[6; 9) "Foo"
     WHITESPACE@[9; 10)
-    ITEM_LIST@[10; 33)
+    ITEM_LIST@[10; 45)
       L_CURLY@[10; 11)
       WHITESPACE@[11; 16)
-      FN_DEF@[16; 31)
+      FN_DEF@[16; 43)
         FN_KW@[16; 18)
         WHITESPACE@[18; 19)
         NAME@[19; 22)
           IDENT@[19; 22) "bar"
-        PARAM_LIST@[22; 30)
+        PARAM_LIST@[22; 42)
           L_PAREN@[22; 23)
           PARAM@[23; 29)
             PLACEHOLDER_PAT@[23; 24)
@@ -25,8 +25,23 @@ SOURCE_FILE@[0; 34)
                 PATH_SEGMENT@[26; 29)
                   NAME_REF@[26; 29)
                     IDENT@[26; 29) "u64"
-          R_PAREN@[29; 30)
-        SEMI@[30; 31)
-      WHITESPACE@[31; 32)
-      R_CURLY@[32; 33)
-  WHITESPACE@[33; 34)
+          COMMA@[29; 30)
+          WHITESPACE@[30; 31)
+          PARAM@[31; 41)
+            BIND_PAT@[31; 36)
+              MUT_KW@[31; 34)
+              WHITESPACE@[34; 35)
+              NAME@[35; 36)
+                IDENT@[35; 36) "x"
+            COLON@[36; 37)
+            WHITESPACE@[37; 38)
+            PATH_TYPE@[38; 41)
+              PATH@[38; 41)
+                PATH_SEGMENT@[38; 41)
+                  NAME_REF@[38; 41)
+                    IDENT@[38; 41) "i32"
+          R_PAREN@[41; 42)
+        SEMI@[42; 43)
+      WHITESPACE@[43; 44)
+      R_CURLY@[44; 45)
+  WHITESPACE@[45; 46)
-- 
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