Allow identifier conditions

Author: esimonov

pkg/analyzer/occurrences.go

@@ -193,6 +193,8 @@ func (nom namedOccurrenceMap) addFromCondition(stmt *ast.IfStmt) {
 				nom.addFromIdent(stmt.If, e.X)
 			}
 		}
+	case *ast.Ident:
+		nom.addFromIdent(stmt.If, v)
 	case *ast.CallExpr:
 		for _, a := range v.Args {
 			switch e := a.(type) {

testdata/testdata.go

@@ -42,6 +42,13 @@ func notUsed_CondCallExpr_NotOK() {
 	}
 }
 
+func notUsed_CondIdent_NotOK() {
+	v := getBool() // want "variable '.+' is only used in the if-statement"
+	if v {
+		return
+	}
+}
+
 func notUsed_Body_NotOK() {
 	v := getValue() // want "variable '.+' is only used in the if-statement"
 	if true {