Can't use unicode escape in native reason

[saitonakamura]

I can't get how to use unicode escaping in reason
i'm writing let oghamSpace = "\u{1680}"; looking at this PR ocaml/ocaml#1232
but i'm getting Warning 14: illegal backslash escape in string.

[OvermindDL1]

What's your backing version of ocaml? (ocamlc -version of whichever your reason toolline is calling)

As I recall it requires a minimum version of OCaml 4.06 (but it might have been 4.06.1 or 4.07?).

[anmonteiro]

@OvermindDL1 even if OCaml has support for it we need to actually implement it in the Reason lexer.

[hcarty]

I tested here on OCaml 4.07.1 + Reason 3.4.0. utop accepts it without issue, but rtop gives the same warning @saitonakamura reported, so it does look like it's a missing feature in the Reason lexer.

[saitonakamura]

I stumbled upon this in Revery package.json, so it's looks like ocaml version is alright

[jordwalke]

Thanks for the report. @hcarty Do you know how to fix this in the Reason lexer? I think that's where this fix would go. And then it would get backported to all previous ocaml compiler versions automatically when using Reason.

[hcarty]

@jordwalke I think the ocaml/ocaml#1232 PR's code could be reused almost directly. I think using that code, though, would require someone with consortium license access to pull it in in order to keep things friendly with Reason's MIT license.

[anmonteiro]

fixed in #2738