Palindromic Quine

A quine is a non-empty computer program which takes no input and produces a copy of its own source code as its only output. Produce such a program.

Additionaly, a palindromic quine is a quine where the source code reads the same forwards and backwards.

Trailing whitespace is NOT stripped from the output for this hole. (Consequently, if your submission doesn't pass, try adding a line break at the end.)