PLC-lang/rusty
using `__VOID` as a type in user code should be an error
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#1,348 opened on 2024/10/24
good first issuemedium-priority
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説明
We currently do not have a validation in place to safeguard against initializing a variable with __VOID. Since the void type does not exist outside of return-types in LLVM, the variable's type is then changed to i32 during codegen.
I think it would make sense to disallow using the type in user code in general, especially seeing as it is prefixed with __.
FUNCTION_BLOCK foo
VAR
x : __VOID;
END_VAR
END_FUNCTION_BLOCK
...
%foo = type { i32 }