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This test checks whether various forms of preincrement expression are allowed.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS ++x is 1
PASS ++window.x is 2
PASS ++window["x"] is 3
PASS ++(x) is 4
PASS ++(window.x) is 5
PASS ++(window["x"]) is 6
PASS (y, ++x) is 7
PASS ++((x)) is 8
PASS ++((window.x)) is 9
PASS ++((window["x"])) is 10
PASS ++(y, x) threw exception ReferenceError: Invalid left-hand side expression in prefix operation.
PASS ++(true ? x : y) threw exception ReferenceError: Invalid left-hand side expression in prefix operation.
PASS ++++x threw exception ReferenceError: Invalid left-hand side expression in prefix operation.
PASS successfullyParsed is true
TEST COMPLETE
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