fix(library/class_instance_resolution): skip (instance) meta-variables that have been assigned by solving unification constraints
fix(library/class_instance_resolution): skip (instance) meta-variables that have been assigned by solving unification constraints

levnach/lean,fpvandoorn/lean,UlrikBuchholtz/lean,digama0/lean,fpvandoorn/lean,levnach/lean,Kha/lean,leanprover-community/lean,leanprover/lean,soonhokong/lean,leodemoura/lean,leanprover/lean,fgdorais/lean,javra/lean,fgdorais/lean,levnach/lean,johoelzl/lean,soonhokong/lean,avigad/lean,fpvandoorn/lean2,fgdorais/lean,avigad/lean,leanprover/lean,fgdorais/lean,soonhokong/lean-osx,soonhokong/lean-windows,soonhokong/lean-osx,leanprover/lean,soonhokong/lean,johoelzl/lean,avigad/lean,rlewis1988/lean,javra/lean,fpvandoorn/lean,Kha/lean,dselsam/lean,dselsam/lean,leodemoura/lean,avigad/lean,javra/lean,fpvandoorn/lean2,Kha/lean,leanprover-community/lean,fpvandoorn/lean2,fgdorais/lean,Kha/lean,fpvandoorn/lean2,Kha/lean,johoelzl/lean,soonhokong/lean,leanprover-community/lean,digama0/lean,leanprover/lean,rlewis1988/lean,UlrikBuchholtz/lean,UlrikBuchholtz/lean,dselsam/lean,leodemoura/lean,avigad/lean,soonhokong/lean-osx,digama0/lean,javra/lean,soonhokong/lean-windows,fgdorais/lean,leanprover/lean,soonhokong/lean-windows,rlewis1988/lean,soonhokong/lean-windows,soonhokong/lean-osx,leanprover-community/lean,digama0/lean,levnach/lean,leanprover-community/lean,leanprover-community/lean,rlewis1988/lean,avigad/lean,UlrikBuchholtz/lean,johoelzl/lean,soonhokong/lean-osx,leodemoura/lean,levnach/lean,rlewis1988/lean,UlrikBuchholtz/lean,fpvandoorn/lean,digama0/lean,johoelzl/lean,dselsam/lean,dselsam/lean,soonhokong/lean,fpvandoorn/lean,soonhokong/lean-windows,johoelzl/lean,leodemoura/lean,dselsam/lean,javra/lean,rlewis1988/lean,fpvandoorn/lean2,leodemoura/lean,fpvandoorn/lean,digama0/lean,Kha/lean