go.mod seems to have a problem with changing length of version strings

[d-schmidt]

What version of Go are you using (go version)?

$ go version
go version go1.14 windows/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\admin\AppData\Local\go-build
set GOENV=C:\Users\admin\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=i:\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=i:\git\apache_download\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\admin\AppData\Local\Temp\go-build612841182=/tmp/go-build -gno-record-gcc-switches

What did you do?

I followed the module docs.

• add import "github.com/anaskhan96/soup"
• go test
• this finds and adds v1.1.1 to go.mod
• because v1.2 is available (https://github.com/anaskhan96/soup/releases/tag/v1.2) I tried to change it and got

go.mod:6: no matching versions for query "v1.2"

• on a hunch after some tries I forked it and "released" a v1.2.0
• go get did find my v1.2.0

What did you expect to see?

go downloading v1.2

What did you see instead?

go downloading v1.1.1 and refusing v1.2

[bcmills]

1.2 is not a well-formed semantic version.

The go get command supports a small set of version queries beyond just canonical semantic versions, but in general it requires tags to be the character v plus a canonical, well-formed semantic version.

For more detail, see https://blog.golang.org/publishing-go-modules.