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passing functions to c causes an assertion failure while compiling #659

cenomla opened this Issue Dec 18, 2017 · 1 comment


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cenomla commented Dec 18, 2017

When a function is passed to c that has ?&void or ?&const void as one of the arguments it causes an assertion failure in the compiler:

zig: /home/cenomla/Workspace/zig/zig/src/analyze.cpp:432: TypeTableEntry* get_maybe_type(CodeGen*, TypeTableEntry*): Assertion 'child_type->type_def' failed.

If c_void is used in place of void then zig just crashes without an assertion.

@andrewrk andrewrk added the bug label Dec 18, 2017

@andrewrk andrewrk added this to the 0.2.0 milestone Dec 18, 2017

@andrewrk andrewrk closed this in 1cc450e Dec 19, 2017


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andrewrk commented Dec 19, 2017

I fixed the assertion failure, and then added a compile error for using &void in a C function because you're supposed to use &c_void. This now works for me:

extern fn foo(ptr: extern fn(?&c_void));

export fn entry() {

extern fn bar(x: ?&c_void) {

zig build-obj test.zig

Let me know if you find another problematic test case.

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