Fix range getindexes

Author: shashi

src/jacobian.jl

@@ -128,6 +128,24 @@ function Cassette.overdub(ctx::JacobianSparsityContext,
     end
 end
 
+function Cassette.overdub(ctx::JacobianSparsityContext,
+                          f::typeof(Base.unsafe_copyto!),
+                          X::Tagged,
+                          xstart,
+                          Y::Tagged,
+                          ystart,
+                          len)
+    S = ctx.metadata
+    if metatype(Y, ctx) <: JacInput
+        val = Cassette.fallback(ctx, f, X, xstart, Y, ystart, len)
+        nometa = Cassette.NoMetaMeta()
+        X.meta.meta[xstart:xstart+len-1] .= (i->Cassette.Meta(ProvinanceSet(i), nometa)).(ystart:ystart+len-1)
+        val
+    else
+        Cassette.recurse(ctx, f, X, xstart, Y, ystart, len)
+    end
+end
+
 function jacobian_sparsity(f!, Y, X, args...;
                            sparsity=Sparsity(length(Y), length(X)),
                            raw = false)