pub fn build_ast<T: CostTracker>(
contract_identifier: &QualifiedContractIdentifier,
source_code: &str,
cost_track: &mut T
) -> ParseResult<ContractAST>
pub fn build_ast<T: CostTracker>(
contract_identifier: &QualifiedContractIdentifier,
source_code: &str,
cost_track: &mut T
) -> ParseResult<ContractAST>