jshint / jshint / 2528

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[[FIX]] Avoid crashing on invalid input (#3046)

A recent extension to the `instanceof` operator introduced logic that
performed property access on the result of parsing the operator's
right-hand expression operand. Because invalid code may not specify such
an expression, this logic led to program crashes in response to the
invalid syntax.

Ensure that when the `instanceof` operator appears without a right-hand
expression operand, JSHint reports a syntax error and exits gracefully.

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