Detach mapping to local in ctx_set_local_type

Similar to the previous fix to ctx_clear_local_types, we must detach
mappings to a local if we are changing its value.

1 files changed, 13 insertions, 0 deletions

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index a164b7a413..8b2d5b044e 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -1599,3 +1599,16 @@ assert_equal '10', %q{
 
   val
 }
+
+# regression test of local type change
+assert_equal '1.1', %q{
+def bar(baz, quux)
+  if baz.integer?
+    baz, quux = quux, nil
+  end
+  baz.to_s
+end
+
+bar(123, 1.1)
+bar(123, 1.1)
+}