[PRISM] Fix VM_CALL_ARGS_SPLAT_MUT failures

prism_compile.c

@@ -1153,6 +1153,7 @@ pm_setup_args(pm_arguments_node_t *arguments_node, int *flags, struct rb_callinf
                     //        ^^
                     if (index + 1 < arguments_node_list.size) {
                         ADD_INSN1(ret, &dummy_line_node, splatarray, Qtrue);
+                        *flags |= VM_CALL_ARGS_SPLAT_MUT;
                     }
                     // If this is the first spalt array seen and it's the last
                     // parameter, we don't want splatarray to dup it.

test/prism/locals_test.rb

@@ -65,7 +65,7 @@ module Prism
 
       filepath = File.join(base, relative)
       define_method("test_#{relative}") { assert_locals(filepath) }
-    end if false # skip until ... uses * and ** and not ruby2_keywords
+    end
 
     def setup
       @previous_default_external = Encoding.default_external

test/prism/newline_test.rb

@@ -11,7 +11,6 @@ module Prism
 
     filepaths.each do |relative|
       define_method("test_newline_flags_#{relative}") do
-        next if relative == 'locals_test.rb'
         assert_newlines(base, relative)
       end
     end