cmd/go: require a module root in 'go list -m' with an unversioned path

Fixes #44803

Change-Id: Ie6ee2e3bca1809c91ecedec75d2c6620da914b29
Reviewed-on: https://go-review.googlesource.com/c/go/+/298752
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/cmd/go/testdata/script/mod_outside.txt b/src/cmd/go/testdata/script/mod_outside.txt
index 9d4c22c77b..7c57db9f7c 100644
--- a/src/cmd/go/testdata/script/mod_outside.txt
+++ b/src/cmd/go/testdata/script/mod_outside.txt
@@ -61,6 +61,11 @@ stderr 'go: cannot match "all": go.mod file not found in current directory or an
 stderr 'go: cannot match "all": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
 ! stdout 'example.com/version'
 
+# 'go list -m <mods>' should fail if any of the mods lacks an explicit version.
+! go list -m example.com/printversion
+stderr 'go: cannot match "example.com/printversion" without -versions or an explicit version: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! stdout 'example.com/version'
+
 # 'go list -m' with wildcards should fail. Wildcards match modules in the
 # build list, so they aren't meaningful outside a module.
 ! go list -m ...