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We shouldn't try to erase the message when in non-color mode; mostly that's intended for redirected output scenarios anyway, and in that case we don't really want garbage in the output. Also, improve the failure messages when the backtracer itself goes wrong or can't be executed. Finally, change the behaviour slightly so that *if* we're explicitly enabled, *and* the backtracer path wasn't explicitly specified, *and* we can't find the backtracer, we print a warning on start-up. We don't do that in any other case because we don't want spurious warnings everywhere. rdar://118055527
What is this? ============= The libexec directory contains the source code for auxiliary executables that ship with the Swift runtime, as opposed to being part of the toolchain. On UNIX-like platforms, if the runtime is installed in /usr/lib/swift (for instance), these are things that you would expect to find in /usr/libexec/swift.