The function is doing something that may allocate with the GC, so mark it as not nogc (not no-how).
location of impure action
format string for error message. Must include "%s %s" for the function kind and name.
(optional) argument to format string
true if function is marked as @nogc, meaning a user error occurred
See Implementation
The function is doing something that may allocate with the GC, so mark it as not nogc (not no-how).