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Parsing for `-enable-upcoming-feature` and `-enable-experimental-feature` is lenient by default because some projects need to be compatible with multiple language versions and compiler toolchains simultaneously, and strict diagnostics would be a nuisance. On the other hand, though, it would be useful to get feedback from the compiler when you attempt to enable a feature that doesn't exist. This change splits the difference by introducing new diagnostics for potential feature enablement misconfigurations but leaves those diagnostics ignored by default. Projects that wish to use them can specify `-Wwarning StrictLanguageFeatures`.