Add staticcheck tool

vendor/honnef.co/go/tools/staticcheck/sa1032/sa1032.go

@@ -0,0 +1,79 @@
+package sa1032
+
+import (
+	"honnef.co/go/tools/analysis/callcheck"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/go/ir"
+	"honnef.co/go/tools/internal/passes/buildir"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "SA1032",
+		Requires: []*analysis.Analyzer{buildir.Analyzer},
+		Run:      callcheck.Analyzer(rules),
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `Wrong order of arguments to \'errors.Is\'`,
+		Text: `
+The first argument of the function \'errors.Is\' is the error
+that we have and the second argument is the error we're trying to match against.
+For example:
+
+	if errors.Is(err, io.EOF) { ... }
+
+This check detects some cases where the two arguments have been swapped. It
+flags any calls where the first argument is referring to a package-level error
+variable, such as
+
+	if errors.Is(io.EOF, err) { /* this is wrong */ }`,
+		Since:    "2024.1",
+		Severity: lint.SeverityError,
+		MergeIf:  lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var rules = map[string]callcheck.Check{
+	"errors.Is": validateIs,
+}
+
+func validateIs(call *callcheck.Call) {
+	if len(call.Args) != 2 {
+		return
+	}
+
+	global := func(arg *callcheck.Argument) *ir.Global {
+		v, ok := arg.Value.Value.(*ir.Load)
+		if !ok {
+			return nil
+		}
+		g, _ := v.X.(*ir.Global)
+		return g
+	}
+
+	x, y := call.Args[0], call.Args[1]
+	gx := global(x)
+	if gx == nil {
+		return
+	}
+
+	if pkgx := gx.Package().Pkg; pkgx != nil && pkgx.Path() != call.Pass.Pkg.Path() {
+		// x is a global that's not in this package
+
+		if gy := global(y); gy != nil {
+			if pkgy := gy.Package().Pkg; pkgy != nil && pkgy.Path() != call.Pass.Pkg.Path() {
+				// Both arguments refer to globals that aren't in this package. This can
+				// genuinely happen for external tests that check that one error "is"
+				// another one. net/http's external tests, for example, do
+				// `errors.Is(http.ErrNotSupported, errors.ErrUnsupported)`.
+				return
+			}
+		}
+
+		call.Invalid("arguments have the wrong order")
+	}
+}