Warn

Emits a compiler warning at every call site of the annotated function. The function remains callable; the warning is informational.

Syntax

@[Warn("Message")]
func DoSomething() {
    // Implementation
}

Examples

Deprecation notice

@[Warn("Use NewApi() instead; OldApi() will be removed in v2.0")]
func OldApi() -> int32 {
    return NewApi();
}

func Main() -> int {
    OldApi(); // warning: use NewApi() instead; OldApi() will be removed in v2.0
    return 0;
}

Unsafe operation advisory

@[Warn("This function bypasses bounds checking; ensure the index is valid")]
func UncheckedGet(arr: *int32, index: uint) -> int32 {
    return *(arr + index);
}