Perhaps the parent was trying to talk about "HM type inference" or something, but
"type deduction" is also a fine name for a subset of type-inference, and perhaps more explicit for C++ and Go.
Perhaps you'd be best up taking it up on wikipedia and primary sources, instead of arguing with random internet people when using their same definitions.
I disagree. Naming things is useful. "Type deduction" says clearly what happens, and is still distinct enough from "type inference" which is a different, more sophisticated concept. I've seen the term "type deduction" used many times in the context of C++ and Rust.
Rust has actual type inference. It just happens to be a local affair. For example, you can create a vector, even an empty one, without explicitly specific its element type. But, somewhere in the current function, you have to provide information about the element type, say, by inserting elements into the vector, or by using an element in a way that constrains its type.
The ability to name things is useful, but there are far more things out there than we can come up with good names for, so we have to decide wisely what things we name and what things we don't. Something like C++'s `auto` doesn't need a name of its own. It's just unidirectionally propagating type information from child to parent nodes in the AST. This is something even FORTRAN (when its name was all caps) and ALGOL implementations did during normal type checking.
