cmd/compile/internal/syntax: better error msg for some 'if' statements

R=go1.11

A common error is to write '=' instead of '==' inside the condition
of a simple 'if' statement:

	if x = 0 { ... }

Highlight the fact that we have an assignment in the error message
to prevent further confusion.

Fixes #23385.

Change-Id: I1552050fd6da927bd12a1be0977bd2e98eca5885
Reviewed-on: https://go-review.googlesource.com/87316
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
1 file changed
tree: 05b1a3ad456b6a4814c3b4920d21b71c8b6b9f83
  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
  18. VERSION
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