Add test of multiple syntax errors.

Where possible, the portion of the line before the error should be
still be interpreted.

MANIFEST

@@ -827,6 +827,8 @@ plugins/sudoers/regress/testsudoers/test10.out.ok
 plugins/sudoers/regress/testsudoers/test10.sh
 plugins/sudoers/regress/testsudoers/test11.out.ok
 plugins/sudoers/regress/testsudoers/test11.sh
+plugins/sudoers/regress/testsudoers/test12.out.ok
+plugins/sudoers/regress/testsudoers/test12.sh
 plugins/sudoers/regress/testsudoers/test2.inc
 plugins/sudoers/regress/testsudoers/test2.out.ok
 plugins/sudoers/regress/testsudoers/test2.sh

plugins/sudoers/regress/testsudoers/test12.out.ok

@@ -0,0 +1,15 @@
+Testing sudoers with multiple syntax errors
+
+sudoers:1: syntax error
+User_Alias A1 = u1 u2 : A2 = u3, u4
+                   ^~
+sudoers:3: syntax error
+millert ALL = /fail : foo
+                         ^
+sudoers:5: syntax error
+root ALL = ALL bar
+               ^~~
+
+User_Alias A1 = u1
+
+millert ALL = /fail

plugins/sudoers/regress/testsudoers/test12.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+#
+# Test sudoers file with multiple syntax errors
+# The standard error output is dup'd to the standard output.
+#
+
+# Avoid warnings about memory leaks when there is a syntax error
+ASAN_OPTIONS=detect_leaks=0; export ASAN_OPTIONS
+
+echo "Testing sudoers with multiple syntax errors"
+echo ""
+./testsudoers -d <<EOF 2>&1 | sed 's/\(syntax error\), .*/\1/' 
+User_Alias A1 = u1 u2 : A2 = u3, u4
+
+millert ALL = /fail : foo
+
+root ALL = ALL bar
+EOF