My guess is that because there's only one Blah, it would be OK. Now try
specializing TTestGen with String.
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But is very strange, that this works:
type
TTestGen = class
constructor Create();
class function Test(val: T): string; inline;
end;
function Blah(const val: Integer): string; inline; //overload;
begin
Result:= IntToStr(val + 1);
end;
{function Blah(const val: string): string; inli
Err... because at the time, T is not yet known. It would still fail to
compile even if you don't do any specialization. I guess the compiler does
type checking while parsing the generic class (and its methods) declaration,
not while specializing (well... it would still do type checking when
special
