問題タブ [pointer-aliasing]

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c++ - C++ template/aliasing - Type/value mismatch at argument 1 in template parameter list

I'm getting my feet wet with aliasing in templated classes, and haven't been able to compile the following code:

I get two compile errors, a type-value mismatch at argument 1 in template parameter list, and a template argument 2 is invalid. However, if I write the following code instead:

then it compiles without errors. According to my understanding, these two statements should do the same thing. What am I not understanding correctly?