Revert "getSourceExpr(): Handle channels" (assert failure)
Revert "getSourceExpr(): Handle channels" (assert failure)

Investigation needed.

This reverts commit e6e61f0a54dac0174df996e93fcfedcac7769ab4.

dtzWill/nix,dtzWill/nix,dtzWill/nix,dtzWill/nix,dtzWill/nix