Go syntax has a subtle ambiguity when converting to pointer types, channel types, or function types without a result list. When a conversion expression starts with *, <-, or func (with no result list), parentheses are required around the type to avoid misinterpretation. For example, *UserDisplay(u) is parsed as *(UserDisplay(u)) rather than a pointer conversion, so (*UserDisplay)(u) is the correct form. A practical example demonstrates converting *User to *UserDisplay using struct tag differences to suppress fields during JSON marshaling.
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