calc builtin conflicts with commonly-used tool

Created by: jbg

Reproduction: Run calc

Expected behavior: The common "C-style arbitrary precision calculator" (website), distributed as a part of *NIX distributions since 1994, launches.

Actual behavior: Apparently my shell is hung, but in fact the shell builtin is waiting for input and does not respond to Ctrl-C.

Maybe I'm one of the last people still using the fantastic calc calculator, but I hope not. Please consider renaming your builtin, or if not, at least make it respond to Ctrl-C :)