Allow OP_RETURN_BLK to cross C boundaries
#6125
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The restriction was introduced in commit b563bcb to resolve mruby#3462. Subsequently, the `RBreak` object, introduced by mruby 1.3.0, allowed crossing the C boundary. ```ruby def cross; Class.new { proc { return }.call }; end; cross # => unexpected return (LocalJumpError) # without this patch # => nothing raised # with this patch ```
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The restriction was introduced in commit b563bcb to resolve #3462. Subsequently, the
RBreakobject, introduced by mruby 1.3.0, allowed crossing the C boundary.