cmd/compile/internal/types2: print assignment operation for invalid operation errors

When invoking check.binary for assignment operation, the expression will
be nil, thus for printing the assignment operation error message, we
need to reconstruct the statement from lhs, op, rhs.

Fixes #48472

Change-Id: Ie38c3dd8069b47e508968d6e43cedcf7536559ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/357229
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2 files changed
tree: 620c7e3ff0be9abad47679052220a20821e72257
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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