cmd/yacc: In 1.5 yacc generate wrong code for '"' token

[mlitvin]

For the following input:

%{
package parser
%}
%%
input: '"'

yacc 1.5rc1 generate a code containing

var yyToknames = [...]string{
        "$end",
        "error",
        "$unk",
        "'"'",
}

The last line doesn't compile.

The 1.4 yacc doesn't generate a token name for '"' so there are no problems.

[mlitvin]

Why 1.6? This is quite ugly (the tool generate code that doesn't compile, and it seems like a save one liner to fix it).

It seems quite a big degradation in a feature that the release notes doesn't even mention as changed.

[robpike]

The fix is trivial. I agree it belongs in 1.5 as it was a recent breaking change. CL coming.

[gopherbot]

CL https://golang.org/cl/13462 mentions this issue.

[mlitvin]

Thanks! (and sorry for not testing it earlier than rc1)