Issue 115674
Summary [Flang] Compilation error when the variable sin is used as sin intrinsic function in block construct
Labels flang:frontend
Assignees
Reporter ohno-fj
    ```
Version of flang-new : 20.0.0(74b56c7eb807e2ba54bd7a2bcfda5d0bceff1c0c)/AArch64
```

When `the variable sin` is used as `sin intrinsic function` in `block` construct, a compilation error occurs.  
The above program is `13-P-21_block_intrinsic2_2.f90`  

If the definition of sin in the following `block` construct:
```
    intrinsic sin
```

is changed to the following, compilation ends normally.
```
 real,intrinsic:: sin
```
The above program is `13-P-21_block_intrinsic2_3.f90`

The following are the test program, Flang-new, Gfortran and ifx compilation/execution result.

13-P-21_block_intrinsic2_2.f90:
```fortran
program main
  implicit none
  real  sin
  sin = 1
  block
 intrinsic sin
    real :: rr = 0
    rr = sin(rr) + 3
    if (rr .ne. 3 ) print *, "NG1", rr
  end block
  sin = sin + 1
  if (sin .ne. 2 ) print *, "NG2", sin
  print *, "PASS"
end program main
```

```
$ flang-new 13-P-21_block_intrinsic2_2.f90
error: Semantic errors in 13-P-21_block_intrinsic2_2.f90
./13-P-21_block_intrinsic2_2.f90:4:3: error: Assignment to procedure 'sin' is not allowed
    sin = 1
 ^^^
./13-P-21_block_intrinsic2_2.f90:11:3: error: Assignment to procedure 'sin' is not allowed
    sin = sin + 1
 ^^^
./13-P-21_block_intrinsic2_2.f90:11:9: error: Function call must have argument list
    sin = sin + 1
 ^^^
./13-P-21_block_intrinsic2_2.f90:12:7: error: Function call must have argument list
    if (sin .ne. 2 ) print *, "NG2", sin
 ^^^
./13-P-21_block_intrinsic2_2.f90:12:36: error: Output item must not be a procedure
    if (sin .ne. 2 ) print *, "NG2", sin
 ^^^
$
```

```
$ gfortran 13-P-21_block_intrinsic2_2.f90; ./a.out
 PASS
$
```

```
$ ifx 13-P-21_block_intrinsic2_2.f90; ./a.out
 PASS
$
```

13-P-21_block_intrinsic2_3.f90:
```fortran
program main
  implicit none
  real  sin
  sin = 1
  block
! intrinsic sin
    real,intrinsic:: sin
    real :: rr = 0
    rr = sin(rr) + 3
    if (rr .ne. 3 ) print *, "NG1", rr
  end block
 sin = sin + 1
  if (sin .ne. 2 ) print *, "NG2", sin
  print *, "PASS"
end program main
```

```
$ flang-new 13-P-21_block_intrinsic2_3.f90; ./a.out
 PASS
$
```

```
$ gfortran 13-P-21_block_intrinsic2_3.f90; ./a.out
 PASS
$
```

```
$ ifx 13-P-21_block_intrinsic2_3.f90; ./a.out
 PASS
$
```

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