`UndefVarError` when using 2+ type-variables in type alias

[topolarity]

julia> struct Foo{T,V,N}; end

julia> const Bar{T,V} = Foo{T,V,1}
Bar (alias for Foo{T, V, 1} where {T, V})

julia> JuliaLowering.include_string(Main, "const Bar{T,V} = Foo{T,V,1}")
ERROR: UndefVarError: `V` not defined in `Main`

Currently blocking SparseArrays from precompiling successfully.