[flang] Add semantics test for event_query subroutine

[ktras]

LGTM!

flang/test/Semantics/event_query.f90

+! RUN: %python %S/test_errors.py %s %flang_fc1
+! XFAIL: *
+! This test checks for semantic errors in event_query() subroutine based on the
+! statement specification in section 16.9.72 of the Fortran 2018 standard.
+
+program test_event_query
+  use iso_fortran_env, only : event_type
+  implicit none
+
+  ! event_type variables must be coarrays
+  type(event_type) non_coarray
+
+  type(event_type) concert[*], occurrences(2)[*]
+  integer non_event[*], counter, array(1), coarray[*], sync_status, coindexed[*], non_scalar(1)
+  integer(kind=1) non_default
+  logical non_integer
+
+  !___ standard-conforming calls with required arguments _______
+
+  call event_query(concert, counter)
+  call event_query(occurrences(1), counter)
+  call event_query(concert, array(1))
+  call event_query(concert, coarray[1])
+  call event_query(event=concert, count=counter)
+  call event_query(count=counter, event=concert)
+
+  !___ standard-conforming calls with all arguments ____________
+  call event_query(concert, counter, sync_status)
+  call event_query(concert, counter, array(1))
+  call event_query(event=concert, count=counter, stat=sync_status)
+  call event_query(stat=sync_status, count=counter, event=concert)
+
+  !___ non-standard-conforming calls _______
+
+  ! event-variable must be event_type
+  call event_query(non_event, counter)
+
+  ! event-variable must be a coarray
+  call event_query(non_coarray, counter)
+
+  ! event-variable must be a scalar variable
+  call event_query(occurrences, counter)
+
+  ! event-variable must not be coindexed
+  call event_query(concert[1], counter)
+
+  ! event-variable has an unknown keyword argument
+  call event_query(events=concert, count=counter)
+
+  ! event-variable has an argument mismatch
+  call event_query(event=non_event, count=counter)
+
+  ! count must be an integer
+  call event_query(concert, non_integer)
+
+  ! count must be an integer scalar
+  call event_query(concert, non_scalar)
+
+  ! count must be have a decimal exponent range
+  ! no smaller than that of default integer
+  call event_query(concert, non_default)
+
+  ! count is an intent(out) argument
+  call event_query(concert, 4)
+
+  ! count has an unknown keyword argument
+  call event_query(concert, counts=counter)
+
+  ! count has an argument mismatch
+  call event_query(concert, count=non_integer)
+
+  ! stat must be an integer
+  call event_query(concert, counter, non_integer)
+
+  ! stat must be an integer scalar
+  call event_query(concert, counter, non_scalar)
+
+  ! stat is an intent(out) argument
+  call event_query(concert, counter, 8)
+
+  ! stat has an unknown keyword argument
+  call event_query(concert, counter, status=sync_status)
+
+  ! stat has an argument mismatch
+  call event_query(concert, counter, stat=non_integer)
+
+  ! stat must not be coindexed
+  call event_query(concert, counter, coindexed[1])
+
+  ! Too many arguments
+  call event_query(concert, counter, sync_status, array(1))
+
+  ! Repeated event keyword
+  call event_query(event=concert, event=occurrences(1), count=counter)
+
+  ! Repeated count keyword
+  call event_query(event=concert, count=counter, count=array(1))
+
+  ! Repeated stat keyword
+  call event_query(event=concert, count=counter, stat=sync_status, stat=array(1))
+
+end program test_event_query