The depends=('') line causes problems. It causes errors in namcap, but more importantly pacman 5.1.0 fails to install it.

loading packages...
resolving dependencies...
warning: cannot resolve "", a dependency of "nash-git"
:: The following package cannot be upgraded due to unresolvable dependencies:
      nash-git

:: Do you want to skip the above package for this upgrade? [y/N] n
error: failed to prepare transaction (could not satisfy dependencies)
:: unable to satisfy dependency '' required by nash-git