Fixes #204. The bug is basically that when linking the base package itself,
the only thing the tracemap does is record the base package as a pin. When
you then try and load the resulting input map, the base package specifier is
treated as a custom user override, since it maps to a filepath and the
extraction algorithm doesn't know how to handle this.
Fixes #204. The bug is basically that when linking the base package itself, the only thing the tracemap does is record the base package as a pin. When you then try and load the resulting input map, the base package specifier is treated as a custom user override, since it maps to a filepath and the extraction algorithm doesn't know how to handle this.