There is definitely source code in that folder. There is a main.go file as 
well as 3 other packages. 
So, go.mod should not be removing all the entries from the go.mod file.

On Friday, 1 April 2022 at 15:43:30 UTC+2 Brian Candler wrote:

> I just updated to 1.18 (from 1.17.6) - on macOS 12.3.1 - and indeed:
> - with just go.mod, I get the warning and go.mod is cleaned up
> - with go.mod plus main.go, I get no warning and go.mod is cleaned up
>
> This looks to me like a bug fix.  If there is no source code, then by 
> definition go.mod should not have any dependent modules.
>
> On Friday, 1 April 2022 at 13:30:40 UTC+1 vaastav...@gmail.com wrote:
>
>> Ok, I just tested this. I only see this behaviour with go 1.18. I tried 
>> using go mod tidy with go1.17 and it worked as expected.
>>
>> On Friday, 1 April 2022 at 14:15:14 UTC+2 vaastav...@gmail.com wrote:
>>
>>> I see this behaviour even in the presence of a main.go file in the same 
>>> directory. This is why I am baffled as to why I am seeing this warning even 
>>> if the source code is present.
>>> It was working fine until I upgraded from go1.17 to go1.18
>>>
>>> On Friday, 1 April 2022 at 11:36:04 UTC+2 Brian Candler wrote:
>>>
>>>> Interesting.  If I put that go.mod file in an empty directory, then I 
>>>> see the warning:
>>>>
>>>> $ go mod tidy
>>>>
>>>> go: warning: "all" matched no packages
>>>> $ go mod tidy
>>>>
>>>> go: warning: "all" matched no packages
>>>> > But when I run `go mod tidy`, it simply prints out the aforementioned 
>>>> warning and the new go.mod file looks like this
>>>>
>>>> I see the same behaviour if I create a main.go file.  Then the warning 
>>>> vanishes and the go.mod file is tidied:
>>>>
>>>> $ mv main.go.x main.go
>>>> $ cat main.go
>>>> package main
>>>>
>>>> func main() {
>>>> }
>>>> $ go mod tidy
>>>> $ cat go.mod
>>>> module module_name_obfuscated
>>>>
>>>> go 1.17
>>>> $ 
>>>>
>>>> This of course is expected behaviour: it's the job of go mod tidy to 
>>>> update the go.mod file so that it matches the source code in the module. 
>>>> See "go help mod tidy":
>>>>
>>>>
>>>>
>>>>
>>>> *"Tidy makes sure go.mod matches the source code in the module.It adds 
>>>> any missing modules necessary to build the current module'spackages and 
>>>> dependencies, and it removes unused modules thatdon't provide any relevant 
>>>> packages."*
>>>>
>>>> So I presume the warning you see is only when go mod tidy can't find 
>>>> any source code in the current directory.
>>>>
>>>> On Thursday, 31 March 2022 at 20:18:52 UTC+1 vaastav...@gmail.com 
>>>> wrote:
>>>>
>>>>> Here are the contents of the go.mod file
>>>>>
>>>>> ```
>>>>> module module_name_obfuscated
>>>>>
>>>>> go 1.18
>>>>>
>>>>> require (
>>>>>     github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
>>>>>     github.com/go-redis/redis/v8 v8.11.4
>>>>>     github.com/go-sql-driver/mysql v1.6.0
>>>>>     github.com/otiai10/copy v1.7.0
>>>>>     github.com/rabbitmq/amqp091-go v1.3.0
>>>>>     github.com/tracingplane/tracingplane-go 
>>>>> v0.0.0-20171025152126-8c4e6f79b148
>>>>>     gitlab.mpi-sws.org/cld/tracing/tracing-framework-go 
>>>>> v0.0.0-20211206181151-6edc754a9f2a
>>>>>     go.mongodb.org/mongo-driver v1.7.4
>>>>>     go.opentelemetry.io/otel/exporters/jaeger v1.2.0
>>>>>     go.opentelemetry.io/otel/exporters/zipkin v1.6.0
>>>>>     go.opentelemetry.io/otel/sdk v1.6.0
>>>>>     go.opentelemetry.io/otel/trace v1.6.0
>>>>>     golang.org/x/mod v0.5.1
>>>>> )
>>>>>
>>>>> require (
>>>>>     github.com/cespare/xxhash/v2 v2.1.2 // indirect
>>>>>     github.com/dgryski/go-rendezvous 
>>>>> v0.0.0-20200823014737-9f7001d12a5f // indirect
>>>>>     github.com/go-logr/logr v1.2.3 // indirect
>>>>>     github.com/go-logr/stdr v1.2.2 // indirect
>>>>>     github.com/go-stack/stack v1.8.0 // indirect
>>>>>     github.com/golang/protobuf v1.5.2 // indirect
>>>>>     github.com/golang/snappy v0.0.4 // indirect
>>>>>     github.com/klauspost/compress v1.13.6 // indirect
>>>>>     github.com/openzipkin/zipkin-go v0.4.0 // indirect
>>>>>     github.com/pkg/errors v0.9.1 // indirect
>>>>>     github.com/xdg-go/pbkdf2 v1.0.0 // indirect
>>>>>     github.com/xdg-go/scram v1.0.2 // indirect
>>>>>     github.com/xdg-go/stringprep v1.0.2 // indirect
>>>>>     github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d // 
>>>>> indirect
>>>>>     go.opentelemetry.io/otel v1.6.0 // indirect
>>>>>     golang.org/x/crypto v0.0.0-20210920023735-84f357641f63 // indirect
>>>>>     golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 // indirect
>>>>>     golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
>>>>>     golang.org/x/text v0.3.7 // indirect
>>>>>     golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // 
>>>>> indirect
>>>>>     google.golang.org/protobuf v1.27.1 // indirect
>>>>> )
>>>>> ```
>>>>>
>>>>> But when I run `go mod tidy`, it simply prints out the aforementioned 
>>>>> warning and the new go.mod file looks like this:
>>>>>
>>>>> ```
>>>>> module module_name_obfuscated
>>>>>
>>>>> go 1.18
>>>>> ```
>>>>> On Thursday, 31 March 2022 at 18:30:13 UTC+2 Brian Candler wrote:
>>>>>
>>>>>> Can you show the contents of the go.mod file in the directory where 
>>>>>> you run "go mod tidy"?
>>>>>>
>>>>>> > I get this error when I run `go list all` as well.
>>>>>>
>>>>>> Try "go list" rather than "go list all" (because in that context, 
>>>>>> "all" is interpreted as the name of a package)
>>>>>>
>>>>>> On Thursday, 31 March 2022 at 16:12:24 UTC+1 vaastav...@gmail.com 
>>>>>> wrote:
>>>>>>
>>>>>>> Hi all,
>>>>>>> I am encountering this problem where when I run `go mod tidy`, it 
>>>>>>> simply returns `go: warning: "all" matched no packages`. I get this 
>>>>>>> error 
>>>>>>> when I run `go list all` as well. 
>>>>>>> I was hoping someone could help me as to why this is happening since 
>>>>>>> I haven't been able to find an explanation for this.
>>>>>>>
>>>>>>> Kind Regards
>>>>>>> Vaastav
>>>>>>>
>>>>>>

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