Revert "Move "inject code" construction into my_parse_code_block"

This commit is probably contains bug causes failing tests:
 #   at t/15_parser_syntax_ok.t line 69.
 # There were 1 warning(s)
 #   Previous test 3 'parser can be parsed also with comments'
 #   Attempt to free unreferenced scalar: SV 0x2d3bc30,
 #     Perl interpreter: 0x24a4010 at .../t/lib/test_tools.pm line 37.

This reverts commit 8163057e94e8efbe69d504ee0b17355186172122.
Prepare release 0.007

 after revert (probably) buggy commit
Add catch blocks without variables in memory_leaks.t