chore(library/type_context): add trace
chore(library/type_context): add trace

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