Extend lexer to handle \ddd escapes in string and character literals #948
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Thus val s = "\001\n" will now work (previously only \" \n \t and \\ worked for backslash escapes).
In the process, also tighten this code so that it fails on more inputs (non-digits, or digits encoding numbers >= 256).
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Thus
val s = "\001\n"
will now work (previously only " \n \t and \ worked for backslash escapes).