The `dir_fd` argument to `execveat()` is not for setting the current working
directory. It is used to resolve relative executable paths, hence explicit
`chdir/fchdir` call is required to set CWD.
Disallow the declaration of new parapoly variables in return types, when
the procedure's parapoly scope is itself. This happens if e.g.:
`foo :: proc() -> $T`.
Closes#3949, #4294, #4563
An incorrect memmove when overriding entities caused multiple ones to point to
the same procedure with incomplete variant data, resulting in later hiting a
compiler assertion.
Introduced delayed type checking for procedure aliases, as it was masked by
the previous error in the override logic.
When a procedure parameter's type was declared in an imported package the type
checker correctly resolved to the parametric type, but it did not check if the
expression that refers to that type conforms to a polymorphic type declaration.
This error was not detected if the procedure was unused, since it was marked as
polymorphic, where further type check is done on instantiation.
Roland Kovacs