Escaped quotes not handled correctly by parser

[apparentlymart]

In the new hand-written scanner/parser, the scanner is correctly handling escaped quotes in quoted sequences -- ensuring that they don't prematurely terminate the string token -- but the parser is missing the rule to replace an escaped quote with a literal quote.

This was reported in hashicorp/terraform#10236 .

[mitchellh]

Note that some BC here is to be expected due to this: hashicorp/hcl#150

[apparentlymart]

Ahh... I had a feeling something had changed somewhere else that had made this behavior different, since I didn't recall seeing this escaped quote handling in the old parser. Glad to see that there's a corresponding HCL change that explains that. 😀