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b819472e74
The `hasValuelessStatics` function in `semtypinst.nim` only checked for `tyStatic`, missing `tyTypeDesc(tyGenericParam)`. This caused `sizeof(T)` inside a typedesc template called from a generic type's `when` clause to error with "'sizeof' requires '.importc' types to be '.completeStruct'". The fix adds a check for `tyTypeDesc` wrapping `tyGenericParam`, recognizing it as an unresolved generic parameter that needs resolution before evaluation. Also documents the `completeStruct` pragma in the manual.
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