Custom marshal enc/decoding impl

parser/Cargo.toml

@@ -26,7 +26,6 @@ itertools = { workspace = true }
 log = { workspace = true }
 num-bigint = { workspace = true }
 num-traits = { workspace = true }
-thiserror = { workspace = true }
 unicode_names2 = { workspace = true }
 
 unic-emoji-char = "0.9.0"

parser/src/parser.rs

@@ -200,7 +200,7 @@ pub fn parse_tokens(
 pub type ParseError = rustpython_compiler_core::BaseError<ParseErrorType>;
 
 /// Represents the different types of errors that can occur during parsing.
-#[derive(Debug, PartialEq, thiserror::Error)]
+#[derive(Debug, PartialEq)]
 pub enum ParseErrorType {
     /// Parser encountered an unexpected end of input
     Eof,
@@ -215,6 +215,8 @@ pub enum ParseErrorType {
     Lexical(LexicalErrorType),
 }
 
+impl std::error::Error for ParseErrorType {}
+
 // Convert `lalrpop_util::ParseError` to our internal type
 fn parse_error_from_lalrpop(
     err: LalrpopError<Location, Tok, LexicalError>,