Daniel Shahaf 750aebc553 driver: Stop requiring function_argzero. ...

Instead, use the %N prompt expando, as suggested by Bart in users/21637.

Avoid the `print -P %N` syntax to save a fork on Cygwin, at the expense
of not supporting zsh's from 2001 through c. 2004 vintages.

Fixes #338.

2016-06-10 15:18:46 +00:00

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