ASSIGN_LEFT:
Substitutor: <empty substitutor>
Substituted pairs:
Foo <: {FooAlias=} Foo (Original: Foo <: {FooAlias=} Foo)

ASSIGN_RIGHT:
Substitutor: <empty substitutor>
Substituted pairs:
Foo <: {FooAlias=} Foo (Original: Foo <: {FooAlias=} Foo)

ASSIGN_ALL:
Substitutor: <empty substitutor>
Substituted pairs:
Foo <: {FooAlias=} Foo (Original: Foo <: {FooAlias=} Foo)
