[ruby/prism] Fix parsing shadow args in lambda blocks

https://github.com/ruby/prism/commit/53efaf252d

1 files changed, 10 insertions, 0 deletions

diff --git a/test/prism/errors_test.rb b/test/prism/errors_test.rb
index 399653ef3e..cb58b3cd21 100644
--- a/test/prism/errors_test.rb
+++ b/test/prism/errors_test.rb
@@ -1363,6 +1363,16 @@ module Prism
       ]
     end
 
+    def test_shadow_args_in_lambda
+      source = "->a;b{}"
+      assert_errors expression(source), source, [
+        ["Expected a `do` keyword or a `{` to open the lambda block", 3..3],
+        ["Expected a newline or semicolon after the statement", 7..7],
+        ["Cannot parse the expression", 7..7],
+        ["Expected a lambda block beginning with `do` to end with `end`", 7..7],
+      ]
+    end
+
     private
 
     def assert_errors(expected, source, errors, compare_ripper: RUBY_ENGINE == "ruby")