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Support function with no return type as callback #2207

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Merged
merged 2 commits into from
Jul 24, 2023
Merged

Support function with no return type as callback #2207

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229c737
ASR: Return nullptr for None return type in Callback
ubaidsk Jul 24, 2023
b7f9127
TESTS: For callback with None return type
ubaidsk Jul 24, 2023
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1 change: 1 addition & 0 deletions integration_tests/CMakeLists.txt
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Expand Up @@ -722,6 +722,7 @@ RUN(NAME global_syms_06 LABELS cpython llvm c)

RUN(NAME callback_01 LABELS cpython llvm c)
RUN(NAME callback_02 LABELS cpython llvm c)
RUN(NAME callback_03 LABELS cpython llvm c)

# Intrinsic Functions
RUN(NAME intrinsics_01 LABELS cpython llvm NOFAST) # any
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13 changes: 13 additions & 0 deletions integration_tests/callback_03.py
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@@ -0,0 +1,13 @@
from lpython import i32, Callable

def foo(x : i32) -> None:
print(x)
assert x == 3

def bar(func : Callable[[i32], None], arg : i32) -> i32:
func(arg)

def main0():
bar(foo, 3)

main0()
4 changes: 4 additions & 0 deletions src/lpython/semantics/python_ast_to_asr.cpp
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Expand Up @@ -1703,6 +1703,10 @@ class CommonVisitor : public AST::BaseVisitor<Struct> {
abi, is_argument);
}

if (AST::is_a<AST::ConstantNone_t>(annotation)) {
return nullptr;
}

if (AST::is_a<AST::Subscript_t>(annotation)) {
AST::Subscript_t *s = AST::down_cast<AST::Subscript_t>(&annotation);
if (AST::is_a<AST::Name_t>(*s->m_value)) {
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