Bug 20221 – __traits(isDeprecated) returns false on deprecated aliases

Manjaro/Arch x86_64, dmd v2.087.1, ldc v1.16.0. __traits(isDeprecated, deprecatedAlias) evaluates whether the aliased symbol is deprecated, not whether the alias is. struct Foo { string good; deprecated alias bad = good; } void main() { Foo f; string good = f.bad; static assert(__traits(isDeprecated, f.bad)); } onlineapp.d(10): Deprecation: alias `onlineapp.Foo.bad` is deprecated onlineapp.d(11): Error: static assert: __traits(isDeprecated, good) is false https://run.dlang.io/is/tLS1o2

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