Perhaps enable soft tabs?
https://manual.macromates.com/en/working_with_text

This is an issue in Python too (at least from PEP8's perspective) - but note that many "make" programs require tabs instead of spaces.

On Sat, Nov 21, 2015 at 11:13 AM, Jeon-Young Kang <jykang22@gmail.com> wrote:

Hello everyone.


I am a newbie of Haskell, using Textmate on mac.


I got the following warning. How can I fix it?


Warning:

    Tab character

Ok, modules loaded: Main.



Sincerely,
Young

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Dan Stromberg