cmd/go: report non-Go files as package error

This change modifies cmd/go/list to format the error correctly in case
-e flag is set. It also fixes a bug where the package loader was only
ever checking the first pattern if it had the go extension. This caused
and error when a file without .go extension was not the first argument.

Fixes #29899

Change-Id: I029bf4465ad4ad054434b8337c1d2a59369783da
Reviewed-on: https://go-review.googlesource.com/c/go/+/166398
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2 files changed
tree: 668353457c6d87be8825565ccf2d6bf02be2c90a
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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