diff --git a/test/inference.jl b/test/inference.jl
index 67c31880cbe024..cda2ff4ed65cb1 100644
--- a/test/inference.jl
+++ b/test/inference.jl
@@ -494,3 +494,10 @@ immutable MyType18457{T,F,G}<:AbstractMyType18457{T,F,G} end
 tpara18457{I}(::Type{AbstractMyType18457{I}}) = I
 tpara18457{A<:AbstractMyType18457}(::Type{A}) = tpara18457(supertype(A))
 @test tpara18457(MyType18457{true}) === true
+
+# Issue #12580
+abstract AbstractMyType12580{T}
+immutable MyType12580{T}<:AbstractMyType12580{T} end
+tpara{A<:AbstractMyType12580}(::Type{A}) = tpara(supertype(A))
+tpara{I}(::Type{AbstractMyType12580{I}}) = I
+@test tpara(MyType12580{true})