update: improve static check

.github/workflows/ci.yml

@@ -12,17 +12,17 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Set up Go 1.17
-        uses: actions/setup-go@v1
+      - name: Set up Go 1.20
+        uses: actions/setup-go@v4
         with:
-          go-version: 1.17
+          go-version: '1.20'
         id: go
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Restore cache
-        uses: actions/cache@v1
+        uses: actions/cache@v3
         with:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -38,8 +38,8 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v2
         with:
-          version: v1.43.0
+          version: v1.52.1

containedctx.go

@@ -34,16 +34,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 				return
 			}
 			for _, field := range structTyp.Fields.List {
-				selectorExpr, ok := field.Type.(*ast.SelectorExpr)
-				if !ok {
-					continue
-				}
-				xname, ok := selectorExpr.X.(*ast.Ident)
-				if !ok {
-					continue
-				}
-				selname := selectorExpr.Sel.Name
-				if xname.Name+"."+selname == "context.Context" {
+				if pass.TypesInfo.TypeOf(field.Type).String() == "context.Context" {
 					pass.Reportf(field.Pos(), "found a struct that contains a context.Context field")
 				}
 			}

plugin/main.go

@@ -14,7 +14,7 @@ import (
 
 // flags for Analyzer.Flag.
 // If you would like to specify flags for your plugin, you can put them via 'ldflags' as below.
-//     $ go build -buildmode=plugin -ldflags "-X 'main.flags=-opt val'" containedctx/plugin/containedctx
+// $ go build -buildmode=plugin -ldflags "-X 'main.flags=-opt val'" containedctx/plugin/containedctx
 var flags string
 
 // AnalyzerPlugin provides analyzers as a plugin.

testdata/src/a/b.go

@@ -0,0 +1,7 @@
+package a
+
+import xcontext "context"
+
+type namedng struct {
+	ctx xcontext.Context // want "found a struct that contains a context.Context field"
+}