Fix locations of NODE_LAMBDA.

* node.h: Add `nd_first_loc` and `nd_set_first_loc`

* parse.y: Fix to start with the beginning of `->` .

  e.g. The locations of the NODE_LAMBDA is fixed:

  ```
  -> x { 1 + 2 }
  ```

  * Before

  ```
  NODE_LAMBDA (line: 1, location: (1,2)-(1,14))
  ```

  * After

  ```
  NODE_LAMBDA (line: 1, location: (1,0)-(1,14))
  ```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 9cb94fd644..431ad0118d 100644
--- a/parse.y
+++ b/parse.y
@@ -2443,6 +2443,9 @@ primary		: literal
 		  lambda
 		    {
 			$$ = $3;
+                    /*%%%*/
+                        nd_set_first_loc($$, @1.beg_pos);
+                    /*% %*/
 		    }
 		| k_if expr_value then
 		  compstmt