Haskell2010 supports

• base-10 (prefix-less),
• base-8 (via 0[oO]-prefix), and
• base-16 (via 0[xX]-prefix) integer literals.

I hereby propose to add conditional support for base-2 integers literals via a 0[bB]-prefix, disabled by default, and controllable via a new {-# LANGUAGE BinaryLiterals #-} language extension flag/pragma.

The use of a 0b prefix for indicating binary literals is known from popular programming languages such as Python, Ruby, and Java.