fix settrans!! implementation

Author: penelopeysm

src/simple_varinfo.jl

@@ -467,8 +467,14 @@ end
 function settrans!!(vi::ThreadSafeVarInfo{<:SimpleVarInfo}, trans)
     return Accessors.@set vi.varinfo = settrans!!(vi.varinfo, trans)
 end
-function settrans!!(::SimpleOrThreadSafeSimple, trans::Bool, vn::VarName)
-    @info "Attempting to call `settrans!!` on a `SimpleVarInfo` for a specific variable `$vn`; this will be ignored"
+function settrans!!(vi::SimpleOrThreadSafeSimple, trans::Bool, ::VarName)
+    # We keep this method around just to obey the AbstractVarInfo interface; however,
+    # this is only a valid operation if it would be a no-op.
+    if trans != istrans(vi)
+        error(
+            "Individual variables in SimpleVarInfo cannot have different `settrans` statuses.",
+        )
+    end
 end
 
 istrans(vi::SimpleVarInfo) = !(vi.transformation isa NoTransformation)