Lazy parameters in fact implemented using delegates and affect @nogc possibility. I propose additions to documentation: https://dlang.org/spec/function.html#parameters section It needs to write that the delegate is used, and explicitly document what exactly happens in the case of several occurrences of the used parameter - whether the delegate is called each time, or only the first, and then the returned value is used (affects non-pure lazy parameters). https://dlang.org/spec/garbage.html#op_involving_gc It will be useful to mention lazy parameters in this list too.
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