ICE when missing extern "c" in C FFI function

[tonyfettes]

pub fn op_mod(self : Double, other : Double) -> Double = "fmod"

[codeworm96]

I reproduced the issue. The error message is:

Error: File "inlined_snapshot/_build/C_of_clam.ml", line 415, characters 14-20: Assertion failed

moonc version: v0.1.20241210+3258bad5b

[codeworm96]

Actually, I encountered a similar issue, but the error message is different. I used the WASM FFI in native backend by mistake:

fn cos(d : Double) -> Double = "Math" "cos"

The error message is:

Error: Failure("TODO: import")