None of these subclasses share any behavior other than what is inherited
from RuntimeError, so we can just get rid of the superclass.

This class is never instantiated directly, and all subclasses
initializers have different signatures and do not rely on this.

This exception is never used outside of the CxxStdlib class, so we don't
need the Homebrew::InstallationError superclass.

Closes Homebrew/linuxbrew#103

Closes Homebrew/homebrew#30830.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#30821.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#29043.

Closes Homebrew/homebrew#21223.

The system certs are too old to be able to read from Github, so
don't try to use the Github API on 1.8.6 either.

Adding a broader exception class allows for errors raised in Resource.fetch
to be caught in upgrade and prevent the process from being killed when
a download fails. This should resolve issue 18364.

Fixes Homebrew/homebrew#18364.
Closes Homebrew/homebrew#26618.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

* issues_matching now returns an array
* prints issues titles and URLs
* find_pull_requests shows closed PRs if no matching PRs are open

Closes Homebrew/homebrew#26032.

Fixes Homebrew/homebrew#19962.

Point users to the tap's issue tracker URL.

Closes Homebrew/homebrew#23757.

Closes Homebrew/homebrew#23669.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Closes Homebrew/homebrew#23430.