Gin docker build error with gin

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Description

when trying to build a project with a dependency of gin, the project cannot be built in docker.

How to reproduce

docker pull golang:1.16
docket run -it golang:1.16 bash
git clone https://github.com/madneal/gshark
cd gshark/server
go env -w GO111MODULE=on \
    && go env -w GOPROXY=https://goproxy.cn,direct \
    && go env -w CGO_ENABLED=0 \
    && go env \
    && go mod tidy \
    && go build -o server .

Expectations

The project can be built without error

Actual result

root@c8d8e646c9b5:/go/gshark/server# go build
core/server_other.go:7:2: //go:build comment without // +build comment
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/context.go:23:2: //go:build comment without // +build comment
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/binding/form_mapping.go:15:2: //go:build comment without // +build comment
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/binding/form_mapping.go:16:2: //go:build comment without // +build comment
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/context.go:24:2: //go:build comment without // +build comment

Environment

• go version: 1.16
• gin version (or commit ref): 1.9.1
• operating system: docker

Comment From: madneal

this issue is fixed with go1.18