Implementation-wise, it's no so difficult to include - the lexer needs to be tweaked. But it seems like a specialised use-case that will only affect a minority of users is probably not worthwhile as an extension to the language/compiler.
Maybe you can try using OverloadedStrings and implement this as a library? ``` newtype Binary = Binary Integer deriving Num instance IsString Binary where fromString binaryLiteral = error "Code here to parse binary literal with underscores" binaryVal :: Binary binaryVal = "1101_1110_0101" ``` Hope that helps, Rahul On Tue, Sep 26, 2017 at 8:40 AM, Takenobu Tani <[email protected]> wrote: > Dear devs, > > GHC's BinaryLiterals extension is useful. > (For example, x = 0b110111000101) > > Is it difficult to include underscore(_) in the format like Verilog-HDL[1] > ? > (For example, x = 0b1101_1100_0101) > > [1]: https://inst.eecs.berkeley.edu/~cs150/fa06/Labs/verilog- > ieee.pdf#page=20 > > Regards, > Takenobu > > > _______________________________________________ > ghc-devs mailing list > [email protected] > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > -- Rahul Muttineni
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