non-executable files in $PATH cause errors

[n952162]

Hello,

I consider it a bug that bash (and its hash functionality) includes
non-executable files in its execution look-up and then (inevitably)
simply reports an error, because its such files aren't  executable.

Perhaps it's there to support PATH look up for arguments to the bash
command.  That would also be a bug.  Why should it be okay to execute a
non-executable script?  Supporting users who are too lazy to chmod a
file ought to be less important than supporting users who want
fine-grain control over what's executable and what's not.