Bug: Labels and nested blocks

[loilo]

From squashing minified [basis.js].

Butternut seems to have problems handling labels: in combination with if/elseand other blocks. It generates invalid semicolons after blocks.

This seems to be an unfixed edge case of #113.

Reproduction:

• Create an if/else structure with no braces around the if block.
• Nest another control structure inside (while, for or switch), with braces around the block and multiple statements inside which are not simply combineable by a comma.
• Precede the nested control structure with a label.

Example input:

if ( any_condition_1 )
  label: while ( any_condition_2 ) {
    var any_value
    any_fn_1()
    break label
  }
else any_fn_2()

Output Butternut:

if(any_condition_1)label:while(any_condition_2){var any_value;any_fn_1();break label};else any_fn_2()
//                                                                           invalid ^

Output UglifyJS:

if(any_condition_1)n:for(;any_condition_2;){var any_value;any_fn_1();break n}else any_fn_2();