another fix

Author: penelopeysm

test/contexts.jl

@@ -148,7 +148,7 @@ Base.IteratorEltype(::Type{<:AbstractContext}) = Base.EltypeUnknown()
             vn = @varname(x[1])
             ctx1 = PrefixContext(@varname(a))
             @test DynamicPPL.prefix(ctx1, vn) == @varname(a.x[1])
-            ctx2 = ConditionContext(Dict(), ctx1)
+            ctx2 = ConditionContext(Dict{VarName,Any}(), ctx1)
             @test DynamicPPL.prefix(ctx2, vn) == @varname(a.x[1])
             ctx3 = PrefixContext(@varname(b), ctx2)
             @test DynamicPPL.prefix(ctx3, vn) == @varname(b.a.x[1])