Index: flang/test/Semantics/synchronization01.f90
===================================================================
--- /dev/null
+++ flang/test/Semantics/synchronization01.f90
@@ -0,0 +1,80 @@
+! 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, non_scalar(1)
+  character(len=128) error_message, co_indexed_character[*], superfluous_errmsg
+  logical invalid_type
+  
+  !___ standard-conforming statement ___
+
+  sync all
+  sync all(stat=sync_status)
+  sync all(                  errmsg=error_message)
+  sync all(stat=sync_status, errmsg=error_message)
+ 
+  !___ non-standard-conforming statement ___
+
+  !______ invalid sync-stat-lists: invalid stat= ____________
+
+  !ERROR: expected execution part construct
+  sync all(status=sync_status)
+
+  ! Stat-variable must an integer scalar
+  !ERROR: TBD
+  sync all(stat=invalid_type)
+
+  ! Stat-variable must an integer scalar
+  !ERROR: TBD
+  sync all(stat=non_scalar)
+
+  ! Invalid sync-stat-list: missing stat-variable
+  !ERROR: expected execution part construct
+  sync all(stat)
+
+  ! Invalid sync-stat-list: missing 'stat='
+  !ERROR: expected execution part construct
+  sync all(sync_status)
+
+  !______ invalid sync-stat-lists: invalid errmsg= ____________
+
+  ! Invalid errmsg-variable keyword
+  !ERROR: expected execution part construct
+  sync all(errormsg=error_message)
+
+  !ERROR: TBD
+  sync all(errmsg=invalid_type)
+
+  ! Invalid sync-stat-list: missing 'errmsg='
+  !ERROR: expected execution part construct
+  sync all(error_message)
+
+  ! Invalid sync-stat-list: missing errmsg-variable
+  !ERROR: expected execution part construct
+  sync all(errmsg)
+
+  !______ invalid sync-stat-lists: redundant sync-stat-list ____________
+
+  ! No specifier shall appear more than once in a given sync-stat-list
+  !ERROR: to be determined
+  sync all(stat=sync_status, stat=superfluous_stat)
+
+  ! No specifier shall appear more than once in a given sync-stat-list
+  !ERROR: to be determined
+  sync all(errmsg=error_message, errmsg=superfluous_errmsg)
+ 
+  !______ invalid sync-stat-lists: coindexed stat-variable ____________
+
+  ! 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