Find bugs in JavaScript programs.

E0152: legacy octal literals may not contain underscores

A legacy octal literal is a 0 digit followed by one or more octal digits (0 through 7). It is a syntax error for a legacy octal literal to contain a digit separator (_):

let fileMode = 01_755;

To fix this error, begin the literal with 0o:

let fileMode = 0o1_755;

Alternatively, remove the underscore:

let fileMode = 01755;

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