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Red, line-length: 10, 49 bytes

s: [prin [
 "s:"
 mold s
 "do s"
]] do s

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This in fact is a Rebol quine

Explanation: Red/Rebol's mold follows the coding style of putting 4 spaces offset.

s: [prin [ ; s is a block; print the following: 
 "s:" ; literal "s:"
 mold s ; the representation of the block itself - all between []
 "do s" ; literal "do s"
]] do s ; evaluate the block