Bug #16506
Updated by sawa (Tsuyoshi Sawada) over 4 years ago
https://ruby-doc.org/core-2.7.0/Module.html#method-i-const_source_location says:
> Returns the Ruby source filename and line number containing **first** definition of constant specified.
It should be:
> Returns the Ruby source filename and line number containing the **last** definition (the effective definition) of the constant specified.
It also has an example line:
```ruby
p Object.const_source_location('A') # => ["test.rb", 1] -- note it is first entry, not "continuation"
```
but that may give the impression that the first-ness is due to the nature of this method. The reason `["test.rb", 1]` is returned instead of `["test.rb", 14]` is because the constant is created at line 1, and is only reopened/modified in line 14. Perhaps, this line can be changed to:
```ruby
p Object.const_source_location('A') # => ["test.rb", 1] -- note 'A' is created in line 1, and is only reopened/modified in "continuation"
```
Adding something like this may make it clear that it is the last definition that is returned:
```ruby
D = 'D1'
D = 'D2'
D = 'D3'
...
Object.const_source_location('D') # => returns the location that corresponds to 'D3'