https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122109
Bug ID: 122109
Summary: gfortran 16 rejects component declaration in composite
derived type with kind parameter
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: damian at archaeologic dot codes
Target Milestone: ---
Unlike PR 93175, the code below involves no length type parameters and requires
triple nesting to reproduce the error message. Also,
1. Removing the allocable attribute on values_ causes an ICE.
2. Removing the expected_outputs_ component causes an ICE.
3. Putting the same code in a program instead of a module compiles without
error.
$ cat reproducer.f90
module tensor_m
implicit none
type tensor_t(k)
integer, kind :: k = kind(1.)
real(k), allocatable :: values_
end type
type input_output_pair_t(k)
integer, kind :: k
type(tensor_t(k)) inputs_, expected_outputs_
end type
type mini_batch_t(k)
integer, kind :: k
type(input_output_pair_t(k)) input_output_pairs_
end type
end module tensor_m
$ gfortran -c reproducer.f90
reproducer.f90:6:35:
6 | real(k), allocatable :: values_
| 1
Error: Cannot convert REAL(0) to REAL(4) at (1)
$ gfortran --version
GNU Fortran (GCC) 16.0.0 20250930 (experimental)
