Function libreda_lefdef::lef_parser::try_read_obs

fn try_read_obs<I>(
    tk: &mut Tokenized<I, LefDefLexer>
) -> Result<Option<Vec<LayerGeometries>>, LefDefParseError>where
    I: Iterator<Item = char> + PeekingNext,

Read obstructions as used in MACRO definitions. Obstruction are defined by syntax of layer geometries.