A renamed version of Error.hi-boot
--- /dev/null
+---------------------------------------------------------------------------
+-- GHCerr.hi-boot
+--
+-- This hand-written interface file is the initial bootstrap version
+-- for GHCerr.hi.
+-- It doesn't need to give "error" a type signature,
+-- because it's wired into the compiler
+---------------------------------------------------------------------------
+
+_interface_ GHerr 1
+_exports_
+GHCerr error;