Add a simple Bash script for syntax tests

tests/syntax-tests/source/Bash/simple.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+function incompatible_function() {
+	:
+}
+
+compatible_function() {
+	if ! [ "$1" == "yes" ]
+	then
+		return 3;:;
+	fi
+	
+	(
+		exec 3>&1
+		echo "finished! $@? $*." >&3 \
+			| cat | bat - | cat
+		exit 4
+	) || exit $?
+}
+
+if command -v bat &> /dev/null; then
+	var=1
+	printf "%s...\n" "$(echo some text)"
+	while true; do
+		echo $var
+
+		if { [[ "$var" -eq 1 && ( true || false ) ]] || false 2>&1 1> /dev/null; } &> /dev/null; then
+			var="$(cat <<< "two")"
+			continue 1
+		fi
+
+		case "$var" in
+			"two") var="three" ;;
+			three) var="four" ;;
+			fo*r)
+				var=five
+				;;
+
+			"fi"ve)
+				var="$(
+					cat       << END
+six > $var
+END
+				)"
+				;;
+
+			$'six\n' | *six*)
+				echo "?"
+				seven=seven
+				while read -r line
+				do
+					var="$line"
+				done << "HEREDOC"
+1
+2
+$seven
+HEREDOC
+				;;
+
+			*'sev'*)
+				export var=eight
+				unset var
+				;;
+
+			'')
+				{ incompatible_function && false; } || compatible_function "yes"
+				break
+				;;
+		esac
+
+		continue
+	done
+fi