abstract_type_decl.m:013: Warning: this declaration of `foo'/0 is redundant,
abstract_type_decl.m:013:   since the type has a definition in the
abstract_type_decl.m:013:   implementation section.
abstract_type_decl.m:014: Warning: this declaration of `bar'/0 is redundant,
abstract_type_decl.m:014:   since the type has a definition in the
abstract_type_decl.m:014:   implementation section.
abstract_type_decl.m:015: Warning: duplicate abstract type declaration for
abstract_type_decl.m:015:   `bar'/0.
abstract_type_decl.m:014:   The original declaration is here.
