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fe2eefc471
The single file parse mode is supposed to enter both branches of an `#if` directive whenever the condition contains undefined identifiers. This patch adds support for undefined function-like macros, where we would previously emit an error that doesn't make sense from end-user perspective. (I discovered this while working on a very similar feature that parses single module only and doesn't enter either `#if` branch when the condition contains undefined identifiers.)