What is GHC.Stack.Types.HasCallStack

[atravers]

A “noise word” ?

https://web.archive.org/web/20221205155031/https://mail.mozilla.org/pipermail/rust-dev/2013-April/003926.html

But this is getting somewhat off-topic (perhaps for a new thread in the New Year…) - the question:

@lukemccartney

Why is head not defined as a safe function instead?

has been answered here:

• @tomjaguarpaw

  It was specified 35 years ago, drawing on decades of precedent, probably going back all the way to Lisp, when programmers and language designers had bigger things to worry about.

• @Kleidukos

  […] so we have to make do with the tools we have now […]