The file solang_parser_pt.rs, in the same directory as this README, is from the following location:

https://github.com/hyperledger-solang/solang/blob/6f9b624573782aa627fb3ee07761d6b52b5619cb/solang-parser/src/pt.rs

The file is used by build.rs to generate a Solang AST visitor implementation.

The file syn_expr.rs is from the following location:

https://github.com/dtolnay/syn/blob/7f2dce7ede0e0d8c973a88f76e61544393be2d3a/src/expr.rs

The file is used by build.rs to define the `expression_with_block` function.
