Escape characters in strings not handled correctly

[balsoft]

This axel file:

(module Main)

(= example "This should be a quotation mark: \"")

(= main (print example))

Transpiles to the following Haskell code:

module Main where
import Axel
import qualified Prelude as GHCPrelude
import qualified Axel.Parse.AST as AST
example  = "This should be a quotation mark: ""
main  = (print example)

Which, for obvious reasons, does not compile.

Is this expected? I couldn't find anything specific about the way Axel is supposed to be treating escapes in the documentation, but the String literals section gives an example which includes an escape sequence.

[jgrosso]

This is rather embarrassing: Turns out, \t (and other escape sequences in general) are also being output inappropriately. In theory, I had golden tests which should've caught this issue. But, apparently, I only ever visually confirmed that the files looked like valid Haskell, instead of actually trying to run them in GHC. Among other things, this meant I couldn't easily tell when inappropriate whitespace like \t snuck in.

Action items for me:

• Fix escape sequences
• Add regression test based on the example above
• Add verification step for Haskell golden test files (see Verify that the golden tests are actually valid Haskell #80).

Thank you so much for catching this!

[jgrosso]

Next is for me to finish #80 and #81, and then I'll push a new release. Thanks again!