Fixing `Error when reading 'bin/main.dart': No such file or directory`

Sometimes when I try to launch my Flutter app, Visual Studio Code throws this at me:

bin/main.dart: Error: Error when reading 'bin/main.dart': No such file or directory
Exited (sigint)

The fix is to open ./vscode/launch.json and to remove the Dart specific config that hardcodes the program path to bin/main.dart.

Maybe deleting it will give me trouble down the line, when I try to run Dart programs? We'll see.