diff --git a/src/jlgen.jl b/src/jlgen.jl
index f9cf153c..d2e11451 100644
--- a/src/jlgen.jl
+++ b/src/jlgen.jl
@@ -614,7 +614,7 @@ function ci_cache_populate(interp, cache, mi, min_world, max_world)
 
         # inference should have populated our cache
         wvc = WorldView(cache, min_world, max_world)
-        @assert CC.haskey(wvc, mi)
+        @assert CC.haskey(wvc, mi) "GPUCompiler: Failed to compile method for $mi, between worlds $min_world and $max_world"
         ci = CC.getindex(wvc, mi)
 
         # if ci is rettype_const, the inference result won't have been cached
@@ -629,7 +629,8 @@ function ci_cache_populate(interp, cache, mi, min_world, max_world)
 
         # inference should have populated our cache
         wvc = WorldView(cache, min_world, max_world)
-        @assert CC.haskey(wvc, mi)
+
+        @assert CC.haskey(wvc, mi) "GPUCompiler: Failed to compile method for $mi, between worlds $min_world and $max_world"
         ci = CC.getindex(wvc, mi)
 
         # if ci is rettype_const, the inference result won't have been cached