Martijn Dekker wrote: >I compile my test shells on x86_64 Mac OS X 10.11.6. >Compiler: Apple LLVM version 8.0.0 (clang-800.0.42.1) I'm on Fedora 28 with 'gcc version 8.1.1 20180712 (Red Hat 8.1.1-5) (GCC)'. I've now tried 'clang version 6.0.1 (tags/RELEASE_601/final)'. dash from current git master gives the same error and the same report from Valgrind. Ron