awk: fix long field separators case. By Ian Wienand (ianw AT vmware.com)

testsuite/awk.tests

@@ -22,6 +22,12 @@ testing "awk hex const 1" "awk '{ print or(0xffffffff,1) }'" "4.29497e+09\n" ""
 testing "awk hex const 2" "awk '{ print or(0x80000000,1) }'" "2.14748e+09\n" "" "\n"
 testing "awk oct const"   "awk '{ print or(01234,1) }'"      "669\n"         "" "\n"
 
+# long field seps requiring regex
+testing "awk long field sep" "awk -F-- '{ print NF, length(\$NF), \$NF }'" \
+	"2 0 \n3 0 \n4 0 \n5 0 \n" \
+	"" \
+	"a--\na--b--\na--b--c--\na--b--c--d--"
+
 # '@(samp|code|file)\{' is an invalid extended regex (unmatched '{'),
 # but gawk 3.1.5 does not bail out on it.
 testing "awk gsub falls back to non-extended-regex" \