What is a pointer type’s region when it’s omitted?

Every pointer type has a region; if you omit it, the compiler chooses a region name you implicitly. The name chosen depends on where the pointer type occurs. In function arguments, a fresh region variable is used.

In function results and type definitions (including typedef), the heap region (`H) is used. In function bodies, the compiler looks at the uses (using unification) to try to determine a region. See Regions and Memory Management Via Regions for more information.

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