How to use the operator <> of overlay

Questions and Answers
2

Hi!

what error message are you receiving? If I do this with vanilla settings I get

    Ambiguous occurrence ‘<>’
    It could refer to
       either ‘Sound.Tidal.Context.<>’,
              imported from ‘Sound.Tidal.Context’
              (and originally defined in ‘Sound.Tidal.Core’)
           or ‘Prelude.<>’,
              imported from ‘Prelude’ (and originally defined in ‘GHC.Base’)

In this case, the problem is that the operator <> is defined both in Prelude (which is a set of standard functions that are automatically imported) and in Sound.Tidal.Context (which is the one you want to use). Consequently the compiler does not know which version of <> you want to use and you have to do this explicitly. To do that you have several options:

  1. Write Sound.Tidal.Context.<> explicitly, i.e.,
d1 $ sound ("bd sn:2" Sound.Tidal.Context.<> "cp*3")

which is a quick fix but is cumbersome to write every time
2. Import prelude without <> to avoid the name clash. You can do this by writing

import Prelude hiding ((<>))

and evaluating the line in tidal. The ambiguity should now be resolved.
3. Define <> explicitly as Sound.Tidal.Context.<>, i.e.,

(<>) = (Sound.Tidal.Context.<>)

Again, evaluate the above line in tidal and <> should now work as expected.

You can add (2.) or (3.) to you boot tidal to avoid having to execute them every time you launch tidal cycles.