Program Repair Shop

Context

In most languages, each operator and builtin has one effect
- You have to memorize the effect of + and printf
In Perl, each operator and builtin has two effects
- You have to memorize both of them
For example:

     $n = @a;

     @v = @a;

     $date_string = localtime();

     @date_components = localtime();

     $one_line = <FILEHANDLE>;

     @all_the_lines = <FILEHANDLE>;