go mod edit does the trick.

Try 

go mod edit -replace=github.com/foo/barr=github.com/bar/foo


go mod edit -replace=github.com/foo/barr=github.com/bar/foo@12345567789


Best

Anderson


On Tuesday, 6 August 2019 07:26:45 UTC+2, Peter Feichtinger wrote:
>
> Thanks for that, this will come in handy for editing the go.mod file.
> But I'd like to avoid editing the file at all.
>
>
> On Monday, August 5, 2019 at 7:16:08 PM UTC+2, Paul Jolly wrote:
>>
>> Take a look at go mod edit
>>
>> https://golang.org/cmd/go/#hdr-Module_maintenance
>>
>>
>>
>> On Mon, 5 Aug 2019, 18:45 Peter Feichtinger, <shi...@gmx.at> wrote:
>>
>>> Hi Go Nuts,
>>>
>>> I have a rather unusual use case and I'm hoping for some input.
>>>
>>> For testing purposes, I want to build a Go binary with different 
>>> versions of one of its dependencies. The only way I could think of was to 
>>> modify the go.mod file to add a replace directive with the version I 
>>> want to test.
>>> Instead I'd like to avoid having to modify the go.mod file during the 
>>> build and specify the replacement on the command line instead, but I don't 
>>> think that's possible.
>>>
>>> Do you guys have any ideas on how else I might accomplish overriding a 
>>> module version during build?
>>>
>>> -- Peter
>>>
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>>>
>>

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