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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