cannot run ../.ly file which includes another file

[Federico Bruni]

Hi all

Can anybody tell me what's wrong with this minimal example?
I would expect the included file to be relative to the location of the 
file which includes it, not to the current working directory. What do 
you think?
The only workaround is using the --include option?

[build (master *+)]$ cat ../song.ily
\version "2.19.0"

myMusic = \relative c' {
 c4 d e f |
}

[build (master *+)]$
[build (master *+)]$ cat ../song.ly
\version "2.19.0"
\include "./song.ily"

\myMusic

[build (master *+)]$ lilypond ../song.ly
GNU LilyPond 2.19.81
Processing `../song.ly'
Parsing...
../song.ly:4:1: error: unknown escaped string: `\myMusic'

\myMusic
../song.ly:4:9: error: syntax error, unexpected end of input, expecting 
'.' or '=' or ','
\myMusic

fatal error: failed files: "../song.ly"