sh: Disallow empty simple commands.

As per POSIX, a simple command must have at least one redirection,
assignment word or command word.

These occured in rare cases such as  eval "f()" .

The extension of allowing no commands inside { }, if, while, for, etc.
remains.

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/regression/bin/sh/parser/empty-cmd1.0 b/tools/regression/bin/sh/parser/empty-cmd1.0
new file mode 100644
index 0000000..f8b01e9
--- /dev/null
+++ b/tools/regression/bin/sh/parser/empty-cmd1.0
@@ -0,0 +1,3 @@
+# $FreeBSD$
+
+! (eval ': || f()') 2>/dev/null