Index: flang/test/Semantics/synchronization01.f90
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--- /dev/null
+++ flang/test/Semantics/synchronization01.f90
@@ -0,0 +1,59 @@
+! RUN: %python %S/test_errors.py %s %flang_fc1
+! XFAIL: *
+! This test checks for semantic errors in sync all statements based on the
+! statement specification in section 11.6.3 of the Fortran 2018 standard.
+
+program test_sync_all
+  implicit none
+
+  integer sync_status, co_indexed_integer[*], superfluous_stat
+  character(len=128) error_message, co_indexed_character[*], superfluous_errmsg
+  logical invalid_stat_variable_type, invalid_errmsg_variable_type
+  
+  !___ standard-conforming calls ___
+
+  sync all
+  sync all(stat=sync_status)
+  sync all(                  errmsg=error_message)
+  sync all(stat=sync_status, errmsg=error_message)
+ 
+  !___ non-standard-conforming calls ___
+
+  !ERROR: expected execution part construct
+  sync all(invalid_stat_specifier=sync_status)
+
+  !ERROR: expected execution part construct
+  sync all(stat=invalid_stat_variable_type)
+
+  !ERROR: expected execution part construct
+  sync all(errmsg=invalid_errmsg_variable_type)
+
+  !ERROR: expected execution part construct
+  sync all(sync_status)
+
+  !ERROR: expected execution part construct
+  sync all(     sync_status, errmsg=error_message)
+
+  !ERROR: expected execution part construct
+  sync all(                  errmsg)
+
+  !ERROR: expected execution part construct
+  sync all(     sync_status, errmsg)
+
+  ! Check constraint C1172 from the Fortran 2018 standard
+  !ERROR: to be determined
+  sync all(stat=sync_status, stat=superfluous_stat)
+
+  ! Check constraint C1172 from the Fortran 2018 standard
+  !ERROR: to be determined
+  sync all(errmsg=error_message, errmsg=superfluous_errmsg)
+ 
+  ! Check constraint C1173 from the Fortran 2018 standard
+  !ERROR: to be determined
+  sync all(stat=co_indexed_integer[1])
+ 
+  ! Check constraint C1173 from the Fortran 2018 standard
+  !ERROR: to be determined
+  sync all(errmsg=co_indexed_character[1])
+
+end program test_sync_all