Function augmented_sixth_to_dominant 

pub fn augmented_sixth_to_dominant(
    possibility: &[Pitch],
    kind: Option<AugmentedSixth>,
    info: Option<&ChordInfo>,
) -> Result<Vec<Pitch>>

Resolves an augmented sixth to the dominant: music21’s augmentedSixthToDominant. The bass and the fifth fall a semitone and the root rises one; a German sixth’s seventh falls a semitone too, and a Swiss sixth’s doubly augmented fourth is respelled where it stands.

kind and info are read off the possibility where not given.

Errors

A possibility that is no augmented sixth, or an Italian one, when they are not given.