sa9008

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• Variables

Variables

var Analyzer = SCAnalyzer.Analyzer

var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
	Analyzer: &analysis.Analyzer{
		Name:     "SA9008",
		Run:      run,
		Requires: []*analysis.Analyzer{inspect.Analyzer, buildir.Analyzer},
	},
	Doc: &lint.RawDocumentation{
		Title: `\'else\' branch of a type assertion is probably not reading the right value`,
		Text: `
When declaring variables as part of an \'if\' statement (like in \"if
foo := ...; foo {\"), the same variables will also be in the scope of
the \'else\' branch. This means that in the following example

    if x, ok := x.(int); ok {
        // ...
    } else {
        fmt.Printf("unexpected type %T", x)
    }

\'x\' in the \'else\' branch will refer to the \'x\' from \'x, ok
:=\'; it will not refer to the \'x\' that is being type-asserted. The
result of a failed type assertion is the zero value of the type that
is being asserted to, so \'x\' in the else branch will always have the
value \'0\' and the type \'int\'.
`,
		Since:    "2022.1",
		Severity: lint.SeverityWarning,
		MergeIf:  lint.MergeIfAny,
	},
})