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lfortran
Official main repository for LFortran

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An `intent(out)` dummy array does not get the default of a component that is itself an array of a derived type Open

bug derived types

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lfortran/lfortran#13306 · Opened Sep 20, 2026
A derived-type component whose own components are all allocatable cannot be omitted from a structure constructor Open

bug derived types

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lfortran/lfortran#13304 · Opened Sep 20, 2026
Wrong result: a structure constructor argument that reads the assignment target sees the new value, not the old one Open

bug derived types

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lfortran/lfortran#13303 · Opened Sep 20, 2026
Wrong result: a structure constructor for an extended type corrupts the parent component and ignores the child's value Open

bug derived types

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lfortran/lfortran#13302 · Opened Sep 20, 2026
Wrong result: `t = f(p%v)` where the pointer `p` was associated with `t` in a branch, across a loop back edge, or inside a callee Open

bug derived types

Difficulty 5/5 Over a week Newbie friendliness 35/100

lfortran/lfortran#13300 · Opened Sep 20, 2026
print and write expand a derived-type I/O item by two different mechanisms, forcing the backend to know component order Open

derived types

Difficulty 5/5 Over a week Newbie friendliness 42/100

lfortran/lfortran#13299 · Opened Sep 20, 2026
class(t), intent(out) :: a(:) is not default-initialized on entry Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13298 · Opened Sep 20, 2026
Whole-array read of a nested member of an array dummy emits invalid LLVM IR (GEP/memcpy verifier errors) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13297 · Opened Sep 20, 2026
Whole-array assignment to a nested member (w%nest%ii = 1) segfaults the compiler in pass_replace_array_op Open

derived types

Difficulty 3/5 1-2 days Newbie friendliness 74/100

lfortran/lfortran#13296 · Opened Sep 20, 2026
Intrinsic assignment to an allocatable component of a different size does not reallocate (F2003 realloc-on-assignment) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lfortran/lfortran#13294 · Opened Sep 20, 2026
Internal write of a module-level derived-type parameter fails module verification (Load operand must be a pointer) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13291 · Opened Sep 20, 2026
List-directed output of a derived type with a nested struct that needs trailing padding prints the following component as 0 Open

derived types

Difficulty 3/5 1-2 days Newbie friendliness 72/100

lfortran/lfortran#13290 · Opened Sep 20, 2026
Templates: the TEMPLATE FUNCTION / TEMPLATE SUBROUTINE prefix spelling (R1611/R1612) is not accepted Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

lfortran/lfortran#13289 · Opened Sep 20, 2026
Templates: DEFERRED INTERFACE blocks (R1503) are not accepted Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lfortran/lfortran#13288 · Opened Sep 20, 2026
Templates: deferred procedures (DEFERRED PROCEDURE (iface) :: p, R1622) are not accepted Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

lfortran/lfortran#13287 · Opened Sep 20, 2026
Templates: deferred constants (DEFERRED INTEGER, PARAMETER :: k, R1618) are not accepted Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

lfortran/lfortran#13286 · Opened Sep 20, 2026
Templates: DEFERRED TYPE with the ABSTRACT or EXTENSIBLE attribute (R1617) is not accepted Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

lfortran/lfortran#13285 · Opened Sep 20, 2026
INSTANTIATE: two renames of the same entity in one ONLY list segfault Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

lfortran/lfortran#13283 · Opened Sep 20, 2026
REPL/Jupyter: a cell declaring an enum or a union aborts with "Duplicating ASR::symbolType::N is not supported yet" Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lfortran/lfortran#13281 · Opened Sep 20, 2026
tests/errors/template_error_09.f90 ICEs with AssertFailed: source_type2->type < 7 under --continue-compilation Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

lfortran/lfortran#13277 · Opened Sep 20, 2026
read statement does not always work for arrays Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

lfortran/lfortran#13273 · Opened Sep 20, 2026
`-g` is fatal when the debug-info tooling is unavailable, rather than degrading to a warning Open

llvm

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13271 · Opened Sep 20, 2026
INSTANTIATE: templated subprogram instantiation (R1626) and rename-list without ONLY (R1625) are not accepted Open

generics

Difficulty 4/5 3-5 days Newbie friendliness 70/100

lfortran/lfortran#13269 · Opened Sep 20, 2026
Error : Report error for TARGET in `assoicated` being not a variable Open

error not reported

Difficulty 3/5 1-2 days Newbie friendliness 72/100

lfortran/lfortran#13265 · Opened Sep 19, 2026
Bug : Upoly variable allocated with `mold` Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

lfortran/lfortran#13263 · Opened Sep 19, 2026
Array constructor with an implied do or an empty type-spec is not size-checked against the assignment target Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 76/100

lfortran/lfortran#13262 · Opened Sep 19, 2026
A function call in an array constructor on the RHS of a masked WHERE assignment is evaluated more than once Open

bug

Difficulty 5/5 Over a week Newbie friendliness 38/100

lfortran/lfortran#13261 · Opened Sep 19, 2026
Error : not reproted error for upoly allocation Open

error not reported

Difficulty 3/5 1-2 days Newbie friendliness 62/100

lfortran/lfortran#13260 · Opened Sep 19, 2026
asr_verify accepts an unfolded StructConstructor as the initializer of a Parameter/module-scope derived-type variable Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lfortran/lfortran#13259 · Opened Sep 19, 2026
PDT instantiation collides with a user type named after the mangled name: a type named t_4 hijacks t(4) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 55/100

lfortran/lfortran#13258 · Opened Sep 19, 2026
Type-bound subroutine named random_number is confused with intrinsic random_number subroutine Open

Difficulty 3/5 1-2 days Newbie friendliness 67/100

lfortran/lfortran#13257 · Opened Sep 19, 2026
PDT logical(k) array component default written as an array constructor fails ASR verify (m_n_data must match the byte size) Open

derived types

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lfortran/lfortran#13256 · Opened Sep 19, 2026
Passing an unallocated allocatable component to a structure constructor is a runtime error (F2018 7.5.10 allows it) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 55/100

lfortran/lfortran#13255 · Opened Sep 19, 2026
Uppercase structure constructor fails when a generic interface shares the derived type's name: "Function 'date_t' not found (not user defined nor intrinsic)" Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

lfortran/lfortran#13254 · Opened Sep 19, 2026
Array section of a character array component of a derived type segfaults (v%a(2:3)) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13253 · Opened Sep 19, 2026
A structure constructor argument is not broadcast to an array-of-derived-type component: outer(a=inner(5)) fills only the first element Open

derived types

Difficulty 3/5 1-2 days Newbie friendliness 76/100

lfortran/lfortran#13250 · Opened Sep 19, 2026
Elements of a derived-type array lose a type(c_ptr) array component's default (c_associated is true, should be false) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 52/100

lfortran/lfortran#13249 · Opened Sep 19, 2026
ICE "Unsupported kind for integer array constant" for a PDT array component default written with int(..., k) Open

derived types

Difficulty 4/5 3-5 days Newbie friendliness 65/100

lfortran/lfortran#13248 · Opened Sep 19, 2026
Regression on PowerPC: #error "unsupported real(16) compiler-rt ABI for this target; add target-specific fp128 ABI wrappers before enabling these entry points" Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lfortran/lfortran#13240 · Opened Sep 19, 2026
associated(a, null()) is accepted; GFortran and Flang both reject NULL() as the TARGET= argument Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

lfortran/lfortran#13238 · Opened Sep 19, 2026
null(mold) for a class(base) pointer dummy is rejected and the error message prints the internal name `derived_type` Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

lfortran/lfortran#13237 · Opened Sep 19, 2026
Bare null() for a type-bound procedure's pointer array dummy is rejected: "null() must have a pointer or allocatable context or a mold argument" Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

lfortran/lfortran#13236 · Opened Sep 19, 2026
associated() on a disassociated assumed-rank pointer dummy p(..) returns .true. Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

lfortran/lfortran#13235 · Opened Sep 19, 2026
null() as an actual argument for an allocatable dummy hits LCOMPILERS_ASSERT in asr_to_llvm.cpp instead of a clean error Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

lfortran/lfortran#13234 · Opened Sep 19, 2026
Under --separate-compilation, a module whose globals the program's TU never visits is never initialized (SIGSEGV) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13233 · Opened Sep 19, 2026
Rejects valid deferred interface Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

lfortran/lfortran#13231 · Opened Sep 19, 2026
C/C++ backends: associated() and pointer association are unimplemented (visit_PointerAssociated missing, visit_Associate only handles ArraySection) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13229 · Opened Sep 19, 2026
Module array of a derived type loses its component default values (the scalar of the same type keeps them) Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

lfortran/lfortran#13228 · Opened Sep 19, 2026
Positional parent component in a structure constructor is flattened and the arguments shift Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lfortran/lfortran#13227 · Opened Sep 19, 2026
ICE: implied-do array constructor as the initializer of a module array of a derived type (visit_ImpliedDoLoop() not implemented) Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lfortran/lfortran#13226 · Opened Sep 19, 2026

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