Allow escaping from ensures through next

Fixes [Bug #21001]

Author: kddnewton

prism_compile.c

@@ -8720,16 +8720,7 @@ pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret,
         const pm_ensure_node_t *cast = (const pm_ensure_node_t *) node;
 
         if (cast->statements != NULL) {
-            LABEL *start = NEW_LABEL(location.line);
-            LABEL *end = NEW_LABEL(location.line);
-            PUSH_LABEL(ret, start);
-
-            LABEL *prev_end_label = ISEQ_COMPILE_DATA(iseq)->end_label;
-            ISEQ_COMPILE_DATA(iseq)->end_label = end;
-
             PM_COMPILE((const pm_node_t *) cast->statements);
-            ISEQ_COMPILE_DATA(iseq)->end_label = prev_end_label;
-            PUSH_LABEL(ret, end);
         }
 
         return;

test/ruby/test_compile_prism.rb

@@ -1192,6 +1192,27 @@ def self.prism_test_ensure_node
 
         res
       RUBY
+
+      # Bug #21001
+      assert_prism_eval(<<~RUBY)
+        RUN_ARRAY = [1,2]
+
+        MAP_PROC = Proc.new do |&blk|
+          block_results = []
+          RUN_ARRAY.each do |value|
+            block_value = blk.call(value)
+            block_results.push block_value
+          end
+          block_results
+        ensure
+          next block_results
+        end
+
+        MAP_PROC.call do |value|
+          break if value > 1
+          next value
+        end
+      RUBY
     end
 
     def test_NextNode