code: function generateFunctionMappingsArray(ast: Ast): $ReadOnlyArray<RangeMapping> {
    const mappings = [];
    forEachMapping(ast, mapping => {
      mappings.push(mapping);
    });
    return mappings;
  }
docs: Same as generateFunctionMap, but returns the raw array of mappings instead
  of encoding it for use in a source map.
  
  Lines are 1-based and columns are 0-based.