I can't find the exact rule about space before compiler directive
openings from
https://golang.org/cmd/compile/#hdr-Compiler_Directives
but it seems like the compiler doesn't recognize it
as a compiler directive if it is preceded by space.
Removing the space made the //go:linkname in the __gomod__.go file
working as intended.

Manually tested.

Update #26404

Change-Id: I589f7203a628b2fa6238d82878029e0f098091b6
Reviewed-on: https://go-review.googlesource.com/c/143977Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>