+ # Exactly one chaining level under \$ctx allowed
+ "\$ctx.vtid.blah == 0"
+ "0 == \$ctx.vtid.blah"
+ "\$ctx.44 == 0"
+ "0 == \$ctx.44"
+ "\$ctx == 0"
+ "0 == \$ctx"
+ # Only \$ctx is supported for now
+ "\$global.value == 0"
+ "0 == \$global.value"