Add error_tolerant option to RubyVM::AST

If this option is enabled, SyntaxError is not raised and Node is
returned even if passed script is broken.

[Feature #19013]

1 files changed, 13 insertions, 0 deletions

diff --git a/test/ruby/test_ast.rb b/test/ruby/test_ast.rb
index d28d7e1fab..c2c5356f83 100644
--- a/test/ruby/test_ast.rb
+++ b/test/ruby/test_ast.rb
@@ -565,4 +565,17 @@ dummy
     assert_in_out_err(["-e", "def foo; end; pp RubyVM::AbstractSyntaxTree.of(method(:foo)).type"],
                       "", [":SCOPE"], [])
   end
+
+  def test_error_tolerant
+    node = RubyVM::AbstractSyntaxTree.parse(<<~STR, error_tolerant: true)
+      class A
+        def m
+          if;
+          a = 10
+        end
+      end
+    STR
+
+    assert_equal(:SCOPE, node.type)
+  end
 end