Re: [PATCH] t4002: fix "diff can read from stdin" syntax

> From: "D. Ben Knoble" <ben.knoble+github@gmail.com>
>
> I noticed this test was producing output like
>
> ```
> t4002-diff-basic.sh: test_expect_successdiff can read from stdin: not found
> ```
>
> which is rather odd. Investigation shows an error of shell syntax:
> foo'abc' is the same as fooabc to the shell. Perhaps obviously, this is
> not a valid command for the test.
>
> I am surprised this doesn't count as an error in the test, but that
> accounts for it going unnoticed.
>
> Signed-off-by: D. Ben Knoble <ben.knoble+github@gmail.com>
> ---