error: missing path in `package` declaration
  --> testdata/parser/package/42.proto:21:1
   |
21 | package 42;
   | ^^^^^^^
   = help: to place a file in the unnamed package, omit the `package`
           declaration; however, using the unnamed package is discouraged

error: unexpected integer literal after `package` declaration
  --> testdata/parser/package/42.proto:21:9
   |
21 | package 42;
   |         ^^ expected `;`
   |
  help: consider inserting a `;`
   |
21 | package; 42;
   |        +

error: unexpected integer literal in file scope
  --> testdata/parser/package/42.proto:21:9
   |
21 | package 42;
   |         ^^ expected identifier, `;`, `.`, `(...)`, or `{...}`

encountered 3 errors
