cmd/go: implicit go install of std in $GOROOT/src has weird error

[bradfitz]

I did this by mistake (hit enter too early) and then noted the kinda weird error message:

bradfitz@go:~/go/src$ go install
can't load package: package std: unknown import path "std": cannot find module providing package std
bradfitz@go:~/go/src$ go install std
bradfitz@go:~/go/src$ echo $?
0

I guess it's correct, as "std" is some alias rather than a package, but maybe it can be made to just work, or have a more helpful error.

Low priority.

/cc @bcmills

[bcmills]

CC @jayconrod

[matloob]

We have a good error now!

matloob@matloob-mac src % go install
no Go files in /Users/matloob/devgo/src