Add test case for variable scope

internal/test_helpers/fixtures/pass_statements

@@ -496,20 +496,25 @@ Debug = true
 [stage-1] [test-4] Running test case: 4
 [stage-1] [test-4] Writing contents to ./test.lox:
 [stage-1] [test-4] [test.lox] {
+[stage-1] [test-4] [test.lox] var world = "outer world";
 [stage-1] [test-4] [test.lox] var bar = "outer bar";
 [stage-1] [test-4] [test.lox] {
+[stage-1] [test-4] [test.lox] world = "modified world";
 [stage-1] [test-4] [test.lox] var bar = "inner bar";
+[stage-1] [test-4] [test.lox] print world;
 [stage-1] [test-4] [test.lox] print bar;
 [stage-1] [test-4] [test.lox] }
-[stage-1] [test-4] [test.lox] print bar;
+[stage-1] [test-4] [test.lox] print world;<|SPACE|> print bar;
 [stage-1] [test-4] [test.lox] }
 [stage-1] [test-4] [test.lox] print bar;
 [stage-1] [test-4] [test.lox] 
 [stage-1] [test-4] $ ./your_program.sh run test.lox
+[your_program] modified world
 [your_program] inner bar
+[your_program] modified world
 [your_program] outer bar
 [your_program] Undefined variable 'bar'.
-[your_program] [line 9]
-[stage-1] [test-4] ✓ 2 line(s) match on stdout
+[your_program] [line 13]
+[stage-1] [test-4] ✓ 4 line(s) match on stdout
 [stage-1] [test-4] ✓ Received exit code 70.
 [stage-1] Test passed.

test_programs/s10/4.lox

@@ -2,11 +2,15 @@
 expected_error_type: runtime
 ---
 {
+ var <<RANDOM_STRING_1>> = "outer <<RANDOM_STRING_1>>";
  var <<RANDOM_STRING_2>> = "outer <<RANDOM_STRING_2>>";
  {
+ <<RANDOM_STRING_1>> = "modified <<RANDOM_STRING_1>>";
  var <<RANDOM_STRING_2>> = "inner <<RANDOM_STRING_2>>";
+ print <<RANDOM_STRING_1>>;
  print <<RANDOM_STRING_2>>;
  }
+ print <<RANDOM_STRING_1>>; 
  print <<RANDOM_STRING_2>>;
 }
 print <<RANDOM_STRING_2>>;