Description of problem:
Following comand
alias r ~user
where user is an non-system user (not necessarily existing one), will trash the
the terminal with random characters.


How reproducible:
Sometimes (always, as long as described conditions are met).

Steps to Reproduce:
0. login at the console (sometimes you can get same effect even in X terminal
window):
1. tcsh
2. alias r ~username
	

Actual Results:   'L,]9[bhYq%'d:+~+2Ue(}xZ%6Ad4yHA(.A|e=45)'<G'`G_^==*eG;t%= @v 



Expected Results:  I should get a prompt.

Additional info:
this cannot be reproduced with tcsh-6.12