Bug #14264 ยป 0001-Add-documentation-for-the-Kernel-warn-uplevel-keywor.patch
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*
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* warning 1
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* warning 2
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*
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* If the <code>:uplevel</code> keyword is given, the string will
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* be prepended with information for the given caller frame in
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* the same format used by the <code>rb_warn</code> C function.
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*
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* # In baz.rb
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* def foo
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* warn("invalid call to foo", uplevel: 1)
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* end
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*
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* def bar
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* foo
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* end
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*
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* bar
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*
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* <em>produces:</em>
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*
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* baz.rb:6: warning: invalid call to foo
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*/
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static VALUE
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