bug#72374: srfi-64: test-apply does not accept convenience specifiers

Hello,

I think I found a bug in (srfi srfi-64) module shipped with GNU Guile.

The specification says the following regarding the test-apply:

> If one or more specifiers are listed then only tests matching the specifiers
> are executed.

The specifiers are defined in `Test specifiers' section:

> [..] For convenience, a specifier may also be a non-procedure value, which is
> coerced to a specifier procedure, as described below for count and name.

That means that following should work:

    (use-modules (srfi srfi-64))
    (test-apply 1 (λ () (test-assert #t)))

However it does not:

    Backtrace:
    In ice-9/boot-9.scm:
      1752:10 12 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
    In unknown file:
              11 (apply-smob/0 #<thunk 7fd0803c7300>)
    In ice-9/boot-9.scm:
        724:2 10 (call-with-prompt _ _ #<procedure default-prompt-handler (k proc)>)
    In ice-9/eval.scm:
        619:8  9 (_ #(#(#<directory (guile-user) 7fd0803cac80>)))
    In ice-9/boot-9.scm:
       2836:4  8 (save-module-excursion _)
      4388:12  7 (_)
    In srfi/srfi-64/testing.scm:
       947:34  6 (test-apply 1 #<procedure 7fd074b30108 at /home/wolf/src/guile-wolfsden/tests…>)
       944:21  5 (test-apply _ #<procedure 7fd074b30108 at /home/wolf/src/guile-wolfsden/tests…>)
       688:12  4 (_)
        648:2  3 (%test-on-test-begin #<test-runner pass-count: 0 fail-count: 0 xpass-count: 0…>)
       266:21  2 (%test-should-execute #<test-runner pass-count: 0 fail-count: 0 xpass-count: …>)
       257:17  1 (%test-any-specifier-matches (1) #<test-runner pass-count: 0 fail-count: 0 xp…>)
       257:17  0 (%test-any-specifier-matches #<test-runner pass-count: 0 fail-count: 0 xpass…> …)

    srfi/srfi-64/testing.scm:257:17: In procedure %test-any-specifier-matches:
    Wrong type to apply: 1

The string variant is also not supported, as in:

    (use-modules (srfi srfi-64))
    (test-apply "t-a" (λ () (test-assert #t)))

Resulting in:

    [..]
    srfi/srfi-64/testing.scm:257:17: In procedure %test-any-specifier-matches:
    Wrong type to apply: "t-a"

Have a nice day
Tomas Volf