[ruby-core:73834] [Ruby trunk Bug#11991][Assigned] `Symbol#match` returns the match position, unlike `String#match` and `Regexp#match`

Issue #11991 has been updated by Yui NARUSE.

Status changed from Open to Assigned
Assignee set to Nobuyoshi Nakada

Considered a bug but for compatibility this shouldn't be backported.

2.4 will introduce incompatibility.

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Bug #11991: `Symbol#match` returns the match position, unlike `String#match` and `Regexp#match`
https://bugs.ruby-lang.org/issues/11991#change-57010

* Author: Tsuyoshi Sawada
* Status: Assigned
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* ruby -v: 
* Backport: 2.0.0: WONTFIX, 2.1: WONTFIX, 2.2: WONTFIX, 2.3: WONTFIX
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`String#match` and `Regexp#match` return a `MatchData` when match succeeds:

~~~RUBY
"".match(//) # => #<MatchData "">
//.match("") # => #<MatchData "">
//.match(:"") # => #<MatchData "">
~~~

But `Symbol#match` returns the match position (like `String#=~`):

~~~RUBY
:"".match(//) # => 0
~~~

Thus, `Symbol#match` behaves differently from `String#match` and `Regexp#match`. This is the documented behavior, but it may be a bug (together with the documentation).

On the other hand, if it is not a bug, what is the rationale?



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