Parse error on \n ->

[qsctr]

The specific sequence of characters \n -> fails to parse:

sawscript> (\n -> n) 1
Parse error at <stdin>:1:5-1:7: Unexpected `->'

however, the following works:

sawscript> (\x -> x) 1
[17:16:43.448] 1
sawscript> (\ n -> n) 1
[17:16:50.798] 1

Since only \n triggers this, I suspect the parser might be inappropriately recognizing the \n string escape sequence outside of a string literal.

[RyanGlScott]

@yav notes that this part of SAWScript's lexer looks very suspicious:

saw-script/src/SAWScript/Lexer.x

Line 74 in 0d6613f

"\n" ;

Due to the double quotes, this indicates a literal string match, and no escaping is done. In fact, we could probably delete this line, since \n is already included as a part of $whitechar:

saw-script/src/SAWScript/Lexer.x

Line 28 in 0d6613f

$whitechar = [\ \t\n\r\f\v]

(I'm unclear if that is sufficient to fix the bug at hand, but it definitely seems related.)