cmd/go: do not miss an error if import path contains "cmd/something"

Fixes #7638

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/87300043

diff --git a/src/cmd/go/get.go b/src/cmd/go/get.go
index e61da7e2ad270a6b8be698fcbfcaac89c4868a1e..fb9a4ae2350d9858ba49451d5b749573d5cb351f 100644 (file)
--- a/src/cmd/go/get.go
+++ b/src/cmd/go/get.go
@@ -143,6 +143,10 @@ var downloadRootCache = map[string]bool{}
 // for the package named by the argument.
 func download(arg string, stk *importStack, getTestDeps bool) {
        p := loadPackage(arg, stk)
+       if p.Error != nil {
+               errorf("%s", p.Error)
+               return
+       }
 
        // There's nothing to do if this is a package in the standard library.
        if p.Standard {