JShell: multi-line comment not detected as incomplete

| Welcome to JShell -- Version 0.610
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-> /** Line 1

-> * line 2
| Error:
| illegal start of expression
| * line 2
| ^

-> */
| Error:
| illegal start of expression
| */
| ^
| Error:
| illegal start of expression
| */
| ^
| Error:
| reached end of file while parsing
| */
| ^