From bb4ac7a6506971dc34b5656f1a69aadc7299fcab Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@jeremyevans.net>
Date: Sat, 4 May 2019 21:43:22 -0700
Subject: [PATCH] Fix use of numbered parameter inside proc that is default
 value of optarg

This allows cases such as:

```ruby
m ->(a = ->{@1}) {a}
m.call.call(1)

m2 ->(a: ->{@1}) {a}
m2.call.call(2)
```

Previously, this would cause a syntax error.

[Bug#15789]
---
 parse.y | 1 +
 1 file changed, 1 insertion(+)

diff --git a/parse.y b/parse.y
index de64746159..fd0810987f 100644
--- a/parse.y
+++ b/parse.y
@@ -3372,6 +3372,7 @@ lambda		:   {
 		    }
 		    {
 			$<num>$ = p->max_numparam;
+			p->max_numparam = 0;
 		    }
 		  f_larglist
 		    {