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  • Added a space to some indentations
  • Created functions for visit_List and visit_Set, which call __sequence_visit
  • Created functions for visit_ListComp, visit_GeneratorExp and visit_SetComp, which call __generator_visit

  - Added a space to some indentations
  - Created functions for visit_List and visit_Set, which call __sequence_visit
  - Created functions for visit_ListComp, visit_GeneratorExp and visit_SetComp, which call __generator_visit
For the following example:
    print codegen.to_source(ast.parse("(1 + 2) * 3", mode="eval"))

Instead of this:
   1 + 2 * 3			# evaluates to 7, which is incorrect

We now get this:
   ((1 + 2) * 3)			# evaluates to 9, which is correct

The generated expression contains a couple more parens than the original expression, but it yields the correct answer.
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