alexander-shaposhnikov added a comment. I've debugged a bit what's going on in https://godbolt.org/z/7h3sPe85h we pass ForConstaintInstantiation=true and this causes us for the in-class FunctionTemplateDecl pick up the outer layer of template args (i.e. MLTAL will contain NumRetainedOuterLevels: 0 0: <T2>), while for the out-of-line FunctionTemplateDecl MLTAL is empty. This breaks the comparison (after the substitution) since Clang thinks that it's removing one layer of template args. For example, if we pass ForConstaintInstantiation=true the code will compile.
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