Fix double-compilation of arrow-function

We transform the arrow function by nesting the expression into a return
statement. If we compile the arrow function twice this would be done twic

Fix double-compilation of arrow-function

We transform the arrow function by nesting the expression into a return
statement. If we compile the arrow function twice this would be done twice,
leading to a compile assertion.

Fix oss-fuzz #60411
Closes GH-11632

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