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[flang] CHECK(array) failed in Folder::ApplyComponent when folding a component of a PARAMETER array of an extended type whose parent has an undefined component type #239945
Description
The following code:
module m
type :: t2
type(t1) :: x = t1()
end type
type, extends(t2) :: t
complex :: z
end type
type(t), parameter :: tz(*) = [t((3., 4.)), t((5., 6.))]
logical, parameter :: test_6 = all(tz%z%im == [4., 6.])
end moduleResulted in this output:
fatal internal error: CHECK(array) failed at /root/llvm-project/flang/lib/Evaluate/fold-implementation.h(343)
Trunk reproducer (-fsyntax-only): https://godbolt.org/z/ser58sKd8
Activity
llvmorg-github-actions commentedon Nov 7, 2026
@llvm/issue-subscribers-flang-frontend
Author: Jiang Yuancheng (YuanchengJiang)
Details
The following code: ```fortran module m type :: t2 type(t1) :: x = t1() end type type, extends(t2) :: t complex :: z end type type(t), parameter :: tz(*) = [t((3., 4.)), t((5., 6.))] logical, parameter :: test_6 = all(tz%z%im == [4., 6.]) end module ```Resulted in this output:
Trunk reproducer (
-fsyntax-only): https://godbolt.org/z/ser58sKd8