Bad location caching for pubspec lint reporting.

[pq]

Specifically, this

library library_names;

yields:

[lint] DO use `lowercase_with_underscores` for package names. (tool/rule.dart, line 1, col 6)

(And shouldn't.)

[pq]

Actually, I think this is a bad location caching issue. Specifically:

[lint] AVOID wrapping fields in getters and setters just to be "safe". (test/rules/unnecessary_getters_setters.dart, line 18, col 3)
[lint] AVOID wrapping fields in getters and setters just to be "safe". (test/rules/unnecessary_getters_setters.dart, line 7, col 3)
[lint] DO use `lowercase_with_underscores` for package names. (tool/rule.dart, line 1, col 6)

I think the last entry should be reporting the pubspec location.