Context: I maintain Atom's go-plus package for go support. I know @ramya-rao-a is also interested in ensuring vscode-go works well with go modules.

There are a variety of failure scenarios for the current master version of gocode when using go modules support (in particular without using vendor mode).

Over time, we may want to edit this issue to describe each of the failure modes and validate that they are fixed. My assumption is that the cache branch and a switch to use golang.org/x/tools/go/packages will both be required to get to completion. @mdempsky do you have specific plans here?