module constants
use, intrinsic :: iso_fortran_env
implicit none
private

    integer, parameter, public :: stdin = input_unit
    integer, parameter, public :: stdout = output_unit
    integer, parameter, public :: stderr = error_unit

    integer, parameter, public :: i8 = int8
    integer, parameter, public :: i16 = int16
    integer, parameter, public :: i32 = int32
    integer, parameter, public :: i64 = int64

    integer, parameter, public :: sp = real32
    integer, parameter, public :: dp = real64
    integer, parameter, public :: qp = real128

end module constants

program main
use, non_intrinsic :: constants
implicit none

    write(stdout,'(a)') 'Hello World!'

end program main

main.f90                               failed.
[ 50%] Compiling...
app/main.f90:2:22:

    2 | use, non_intrinsic :: constants
      |                      1
Fatal Error: Cannot open module file ‘constants.mod’ for reading at (1): No such file or directory
compilation terminated.
<ERROR> Compilation failed for object " app_main.f90.o "
<ERROR>stopping due to failed compilation
STOP 1