--- /dev/null
+! { dg-do run }
+!
+! PR fortran/56743
+!
+! Contributed by Kai Gallmeister
+!
+! Note that Fortran 2008 (Section 10.11.3.6) requires that there is
+! a value separator between the value and the "!". Thus, all examples
+! in this file are invalid; they should either be accepted as vendor
+! extension or lead to a run-time error (iostat /=0).
+!
+! For the c1 and c2 character example, please note that the Fortran
+! standard (F2008, 10.11.3.3) requires delimiters; accepting
+! a single word (in spirit of list-directed I/O) would be possible
+! as vendor extension. But the current run-time failure is fine as well.
+!
+! Note: After fixing this, warning or error is given with -pedantic -std=xxx
+implicit none
+integer :: i = -1
+real :: r1 = -2
+real :: r2 = -3
+real :: r3 = -4
+real :: r4 = -5
+real :: r5 = -6
+complex :: c = (-7,-7)
+logical :: ll = .false.
+character :: c1 = 'X'
+character(3) :: c2 = 'YYY'
+character(3) :: c3 = 'ZZZ'
+namelist /nml/ i, r1,r2,r3,r4,r5,c,ll,c1,c2,c3
+
+open (99, file='nml.dat', status="replace")
+write(99,*) "&nml"
+write(99,*) " i=42!11" ! Fixed BUG: wrong result: Unmodified, no error
+write(99,*) " r1=43!11" ! Fixed BUG: wrong result: Unmodified, no error
+write(99,*) " r2=43.!11" ! Fixed BUG: wrong result: Unmodified, no error
+write(99,*) " r3=inf!11" ! OK: run-time error (Cannot match namelist object)
+write(99,*) " r4=NaN(0x33)!11" ! OK: run-time error (Cannot match namelist object)
+write(99,*) " r5=3.e5!11" ! Fixed BUG: wrong result: Unmodified, no error
+write(99,*) " c=(4,2)!11" ! OK: value accepted as vendor extension
+write(99,*) " ll=.true.!11" ! OK: value accepted as vendor extension
+write(99,*) " c1='a'!11" ! OK: without quotes, run-time error (Cannot match namelist object)
+write(99,*) " c2='bc'!11" ! OK: without quotes, run-time error (Cannot match namelist object)
+write(99,*) " c3='ax'!11" ! OK: without quotes, run-time error (Cannot match namelist object)
+write(99,*) "/"
+
+rewind(99)
+read (99, nml=nml)
+!write (*, nml=nml)
+close (99, status="delete")
+
+ if (r1 /= 43) call abort ()
+ if (r2 /= 43) call abort ()
+ if (r3 /= r3 .or. r3 <= huge(r3)) call abort ()
+ if (r4 == r4) call abort ()
+ if (r5 /= 300000) call abort ()
+ if (c /= cmplx(4,2)) call abort ()
+ if (.not. ll) call abort ()
+ if (c1 /= "a") call abort ()
+ if (c2 /= "bc") call abort ()
+ if (c3 /= "ax") call abort ()
+end