Bad escape in Show

[nwolverson]

Sorry if this is the wrong place - but I think it's maybe multiple issues.

I get the following error from psc-bundle 0.8.3 (only on Windows!):

Error in module Prelude (Foreign):

  The module could not be parsed:
  lexical error @ line 216 and column 14

This points at:

purescript-prelude/src/Prelude.js

Line 216 in 4c97cec

case "\a": return "'\\a'";

The same line is present in the 1.0-rc modularised version. As far as I can see (eg MDN) \a isn't actually a JavaScript string escape sequence, which is why I think it's an issue here - can we remove it? On the other hand the behaviour for an unknown escape should be to pass it through (\a means precisely a), which would be an issue for language-javascript, probably post purescript/purescript#1966.

[joelgrus]

I am having the same issue on Ubuntu, as linked above.

[garyb]

Just to check, you're getting this from the v0.1.4 library release when compiled with psc 0.8.3?

[garyb]

@michaelficarra can you comment on the escape sequence issue at all here? Is \a redundant, or is there something we should be handling?

[nwolverson]

I am, a fresh install from npm of 0.8.3 and using 0.1.4. (Though seems clear the same would hold of 1.0.0-rc2).

As noted on the linked issue psc doesn't compile "\a" to "\a" in PureScript source.

[garyb]

Ok, yep, I see it too. Thanks.

I wonder why it was fine in 0.8.2...

[alogic0]

language-javascript can't parse this file until comment strings where is "\a":

GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
Prelude> :m +Language.JavaScript.Parser
Prelude Language.JavaScript.Parser> parseFile "purescript-prelude/src/Data/Show.js"   
*** Exception: "lexical error @ line 18 and column 14"

[michaelficarra]

@garyb That was my bad. I will remove it.