ruby-core

Issue #13505 has been reported by Eregon (Benoit Daloze).

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Bug #13505: circular require prints the backtrace directly to stderr
https://bugs.ruby-lang.org/issues/13505

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-04-24 trunk 58466) [x86_64-linux]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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The "loading in progress, circular require considered harmful" warning prints the caller backtrace directly to stderr:

~~~ c
    if (RTEST(ruby_verbose)) {
	rb_warning("loading in progress, circular require considered harmful - %s", ftptr);
	rb_backtrace_print_to(rb_stderr);
    }
~~~

This is suboptimal as rb_warning now eventually delegates to Warning.warn, which can handle the warning, but not the backtrace printed separetely to $stderr.
I think the backtrace should be sent together to Warning.warn so the entire warning can be treated/filtered/etc correctly in Warning.warn.



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