[ruby-core:99093] [Ruby master Bug#17020] ObjectSpace.trace_object_allocations_stop raises if called before trace_object_allocations_start

Issue #17020 has been updated by nobu (Nobuyoshi Nakada).

Assignee set to byroot (Jean Boussier)

A possible alternative might be an exception, I thought first, but it isn’t a single condition.
Could you add the test?

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Bug #17020: ObjectSpace.trace_object_allocations_stop raises if called before trace_object_allocations_start
https://bugs.ruby-lang.org/issues/17020#change-86466

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Assignee: byroot (Jean Boussier)
* ruby -v: ruby 2.5.8p224 (2020-03-31 revision 67882) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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The error is easy to reproduce:

e.g. on Ruby 2.3:

```
$ ruby -robjspace -e 'ObjectSpace.trace_object_allocations_stop'
-e:1:in `trace_object_allocations_stop': wrong argument type false (expected tracepoint) (TypeError)
	from -e:1:in `<main>'
```

Up to ruby 2.7.1:

```
$ ruby -robjspace -e 'ObjectSpace.trace_object_allocations_stop'
Traceback (most recent call last):
	1: from -e:1:in `<main>'
-e:1:in `trace_object_allocations_stop': wrong argument type false (expected tracepoint) (TypeError)
```

Patch: https://github.com/ruby/ruby/pull/3001



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