cmd/compile: don't bother compiling functions named "_"

They can't be used, so we don't need code generated for them. We just
need to report errors in their bodies.

This is the minimal CL for 1.12. For 1.13, CL 158845 will remove
a bunch of special cases sprinkled about the compiler to handle "_"
functions, which should (after this CL) be unnecessary.

Update #29870

Change-Id: Iaa1c194bd0017dffdce86589fe2d36726ee83c13
Run-TryBot: Keith Randall <>
Reviewed-by: Brad Fitzpatrick <>
TryBot-Result: Gobot Gobot <>
3 files changed
tree: 1f7efa777c793079cf2fe349b06359e761026a2f
  1. .gitattributes
  2. .github/
  3. .gitignore
  10. api/
  11. doc/
  12. favicon.ico
  13. lib/
  14. misc/
  15. robots.txt
  16. src/
  17. test/

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