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I was surprised to find that this code compiles:
pure string Foo = SomePureFunction(123);
pure is only mentioned in the context of functions in the online documentation.
What are pure variables, and how are they different from immutable and const ones?
The attribute just has no effect in this case. It’s a known issue in DMD, there are quite a number other similar cases, where attributes are not rejected, but don’t have any effect as well.