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dearblue
ad576f1e75
This reverts commit ad2e626e7a.
Because of the changes made by #6282, the following code caused a problem.
```ruby
b = proc { break "BAD!" }
p self.tap { b.call }
# (expected) => break from proc-closure (LocalJumpError)
# (after #6282) => "BAD!"
```
I revived the `mrb_callinfo::blk` field to fix this, but it did not overcome the following problem.
```ruby
def m(&b); b = b.clone; GC.start; b.call; end
p m { break "OK!" }
# (expected) => "OK!"
# (revived blk) => break from proc-closure (LocalJumpError)
```