Improve thrown FormatException from int.parse when there is an "invalid radix-n" number

[Luckey-Elijah]

The following code throws a FormatException

void main() {
  final value = int.parse('1.0');
}

Full error:

Unhandled exception:
FormatException: Invalid radix-10 number (at character 1)
1.0
^

#0      int._handleFormatError (dart:core-patch/integers_patch.dart:126:5)
#1      int._parseRadix (dart:core-patch/integers_patch.dart:137:16)
#2      int._parse (dart:core-patch/integers_patch.dart:98:12)
#3      int.parse (dart:core-patch/integers_patch.dart:60:12)
#4      main (package:dpad/intparse.dart:2:21)
#5      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:297:19)
#6      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

It seems like the point to the incorrect character (1). Should it not be pointing to the . character (2) in this case?

Version

dart --version
Dart SDK version: 3.3.4 (stable) (Tue Apr 16 19:56:12 2024 +0000) on "macos_x64"

[lrhn]

In some cases, the parser doesn't know the point of failure, because it's written to be optimized for parsing correct numbers, and recording extra positions would be overhead. I don't know if this is one of those cases. Probably not.

Could probably have a second pass to look for invalid characters then.