Improve weird Go compiler error "malformed module path: missing dot in first path element"

[jfrohnhofen]

Full example: "build command-line-arguments: cannot load exp-compute/vta/hw/dta_v1/sim: malformed module path "exp-compute/v
ta/hw/dta_v1/sim": missing dot in first path element"

The error occurs when importing some package that does not exist (i.e., there is no .go file in that directory). So Go is correct, but it should show the file the wrong import occurs in (instead of "command-line-arguments") and the "missing dot" part is also misleading.

The "command-line-arguments" problem can probably be solved by doing "go compile" and running the binary instead of the current "go run".