Check whether a const is defined before getting it#228
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y-yagi wants to merge 1 commit into
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Currently, if an unexist const was specified, a namespace in an error
message is `URI::RFC2396_Parser`.
```
$ ruby -w -r "uri" -e "puts URI::Mailto"
lib/uri/common.rb:57:in 'Module#const_get': uninitialized constant URI::RFC2396_Parser::Mailto (NameError)
elsif value = RFC2396_Parser.const_get(const)
```
I think this is misleading a little. This PR fixes to show a correct namespace.
```
$ ruby -w -r "uri" -e "puts URI::Mailto"
lib/uri/common.rb:61:in 'URI.const_missing': uninitialized constant URI::Mailto (NameError)
Did you mean? URI::MailTo
```
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Currently, if an unexist const was specified, a namespace in an error message is
URI::RFC2396_Parser.I think this is misleading a little. This PR fixes to show a correct namespace.