bin/52591: Missing interpreter error is confusing

[coypu%sdf.org@localhost]

>Number:         52591
>Category:       bin
>Synopsis:       Missing interpreter error is confusing
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 02 20:45:00 +0000 2017
>Originator:     coypu
>Release:        NetBSD 8.99.2
>Organization:
>Environment:
NetBSD localhost 8.99.2 NetBSD 8.99.2 (GENERIC) #1: Fri Sep  1 02:38:58 IDT 2017  fly@loggy:/home/fly/x86/sys/arch/amd64/compile/GENERIC amd64

>Description:
$ echo "#!/non/existent" > test.sh
$ chmod +x test.sh
$ ./test.sh
sh: ./test.sh: not found


it's /non/existent that isn't found
>How-To-Repeat:

>Fix: