realm generate fails with SourceSpanMixin error

[schnaser]

What happened?

When I run dart run realm generate, I see the error outlined further down in this report.

WORKAROUND: I have pinned in my pubspec.yaml like so:

dependency_overrides:
  source_span: 1.10.0

Repro steps

Attempt to run realm generate with source_span 1.10.1

Version

Realm 3.4.1
Dart 3.5.3

What Atlas Services are you using?

Local Database only

What type of application is this?

Other

Client OS and version

MacOS 15.1.1 (24B91)

Code snippets

No response

Stacktrace of the exception/crash you're getting

No response

Relevant log output

[INFO] Generating build script...
[INFO] Generating build script completed, took 135ms

[INFO] Precompiling build script......
[WARNING] ../../../../.pub-cache/hosted/pub.dev/realm_generator-20.0.0/lib/src/expanded_context_span.dart:6:32: Error: The class 'SourceSpanMixin' can't be used as a mixin because it isn't a mixin class nor a mixin.
class ExpandedContextSpan with SourceSpanMixin implements FileSpan {
                               ^
[INFO] Precompiling build script... completed, took 2.0s

[SEVERE] Failed to precompile build script .dart_tool/build/entrypoint/build.dart.
This is likely caused by a misconfigured builder definition.