go/analysis/passes/tests: enable fuzz checks in 'tests' analysis pass for cmd/vet

This will remove the flag analysisinternal.DiagnoseFuzzTests created during golang/go#50198.Malformed fuzz target check will be enabled for cmd/vet.

For golang/go#46218

Change-Id: I5cc8d685a57060f8dd84c1957f0d296a6205ddb6
Reviewed-on: https://go-review.googlesource.com/c/tools/+/471295
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Nooras Saba‎ <saba@golang.org>

Author: ansaba

go/analysis/passes/tests/doc.go

@@ -9,7 +9,7 @@
 //
 // tests: check for common mistaken usages of tests and examples
 //
-// The tests checker walks Test, Benchmark and Example functions checking
+// The tests checker walks Test, Benchmark, Fuzzing and Example functions checking
 // malformed names, wrong signatures and examples documenting non-existent
 // identifiers.
 //

go/analysis/passes/tests/tests.go

@@ -17,7 +17,6 @@ import (
 
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/internal/analysisutil"
-	"golang.org/x/tools/internal/analysisinternal"
 	"golang.org/x/tools/internal/typeparams"
 )
 
@@ -68,9 +67,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 				checkTest(pass, fn, "Test")
 			case strings.HasPrefix(fn.Name.Name, "Benchmark"):
 				checkTest(pass, fn, "Benchmark")
-			}
-			// run fuzz tests diagnostics only for 1.18 i.e. when analysisinternal.DiagnoseFuzzTests is turned on.
-			if strings.HasPrefix(fn.Name.Name, "Fuzz") && analysisinternal.DiagnoseFuzzTests {
+			case strings.HasPrefix(fn.Name.Name, "Fuzz"):
 				checkTest(pass, fn, "Fuzz")
 				checkFuzz(pass, fn)
 			}

go/analysis/passes/tests/tests_test.go

@@ -7,21 +7,12 @@ package tests_test
 import (
 	"testing"
 
-	"golang.org/x/tools/internal/analysisinternal"
-
 	"golang.org/x/tools/go/analysis/analysistest"
 	"golang.org/x/tools/go/analysis/passes/tests"
 	"golang.org/x/tools/internal/typeparams"
 )
 
 func Test(t *testing.T) {
-	// In 1.18, diagnostic for Fuzz Tests must not be used by cmd/vet.
-	// So the code for Fuzz tests diagnostics is guarded behind flag analysisinternal.DiagnoseFuzzTests
-	// Turn on the flag DiagnoseFuzzTests for analysis tests and then turn it off.
-	analysisinternal.DiagnoseFuzzTests = true
-	defer func() {
-		analysisinternal.DiagnoseFuzzTests = false
-	}()
 	testdata := analysistest.TestData()
 	pkgs := []string{
 		"a",        // loads "a", "a [a.test]", and "a.test"

gopls/doc/analyzers.md

@@ -554,7 +554,7 @@ started by the test. For example:
 
 check for common mistaken usages of tests and examples
 
-The tests checker walks Test, Benchmark and Example functions checking
+The tests checker walks Test, Benchmark, Fuzzing and Example functions checking
 malformed names, wrong signatures and examples documenting non-existent
 identifiers.
 

gopls/internal/lsp/source/api_json.go

@@ -19,15 +19,10 @@ import (
 
 	"golang.org/x/tools/gopls/internal/hooks"
 	"golang.org/x/tools/gopls/internal/lsp/cmd"
-	"golang.org/x/tools/internal/analysisinternal"
 	"golang.org/x/tools/internal/tool"
 )
 
 func main() {
-	// In 1.18, diagnostics for Fuzz tests must not be used by cmd/vet.
-	// So the code for Fuzz tests diagnostics is guarded behind flag analysisinternal.DiagnoseFuzzTests
-	// Turn on analysisinternal.DiagnoseFuzzTests for gopls
-	analysisinternal.DiagnoseFuzzTests = true
 	ctx := context.Background()
 	tool.Main(ctx, cmd.New("gopls", "", nil, hooks.Options), os.Args[1:])
 }

gopls/main.go

@@ -15,10 +15,6 @@ import (
 	"strconv"
 )
 
-// DiagnoseFuzzTests controls whether the 'tests' analyzer diagnoses fuzz tests
-// in Go 1.18+.
-var DiagnoseFuzzTests bool = false
-
 func TypeErrorEndPos(fset *token.FileSet, src []byte, start token.Pos) token.Pos {
 	// Get the end position for the type error.
 	offset, end := fset.PositionFor(start, false).Offset, start