Add non-undeclared declarations for ReDimed array without dclaration

Author: MDoerner

Rubberduck.Parsing/VBA/DeclarationCaching/DeclarationFinder.cs

@@ -974,6 +974,9 @@ public Declaration OnUndeclaredVariable(Declaration enclosingProcedure, string i
         {
             var annotations = FindAnnotations(enclosingProcedure.QualifiedName.QualifiedModuleName, context.Start.Line)
                 .Where(annotation => annotation.AnnotationType.HasFlag(AnnotationType.IdentifierAnnotation));
+
+            var isReDimVariable = IsContainedInReDimedArrayName(context);
+
             var undeclaredLocal =
                 new Declaration(
                     new QualifiedMemberName(enclosingProcedure.QualifiedName.QualifiedModuleName, identifierName),
@@ -988,12 +991,12 @@ public Declaration OnUndeclaredVariable(Declaration enclosingProcedure, string i
                     context,
                     null,
                     context.GetSelection(),
-                    false,
+                    isReDimVariable,
                     null,
                     true,
                     annotations,
                     null,
-                    true);
+                    !isReDimVariable);
 
             var hasUndeclared = _newUndeclared.ContainsKey(enclosingProcedure.QualifiedName);
             if (hasUndeclared)
@@ -1017,6 +1020,13 @@ public Declaration OnUndeclaredVariable(Declaration enclosingProcedure, string i
             return undeclaredLocal;
         }
 
+        private static bool IsContainedInReDimedArrayName(ParserRuleContext context)
+        {
+            var enclosingReDimContext = context.GetAncestor<VBAParser.RedimVariableDeclarationContext>();
+            return enclosingReDimContext != null 
+                   && enclosingReDimContext.expression().GetSelection().Contains(context.GetSelection());
+        }
+
 
         public void AddUnboundContext(Declaration parentDeclaration, VBAParser.LExpressionContext context, IBoundExpression withExpression)
         {

RubberduckTests/Inspections/UndeclaredVariableInspectionTests.cs

@@ -88,6 +88,35 @@ Debug.Print a
             }
         }
 
+        [Test]
+        [Category("Inspections")]
+        //ReDim acts as a declaration if the array is not declared already.
+        //See issue #2522 at https://github.com/rubberduck-vba/Rubberduck/issues/2522
+        public void UndeclaredVariable_ReturnsNoResultForReDim()
+        {
+            const string inputCode =
+                @"
+Sub Test()
+    Dim bar As Variant
+    ReDim arr(1 To 42) 
+    bar = arr
+End Sub";
+
+            var builder = new MockVbeBuilder();
+            var project = builder.ProjectBuilder("VBAProject", ProjectProtection.Unprotected)
+                .AddComponent("MyClass", ComponentType.ClassModule, inputCode)
+                .Build();
+            var vbe = builder.AddProject(project).Build();
+
+            using (var state = MockParser.CreateAndParse(vbe.Object))
+            {
+                var inspection = new UndeclaredVariableInspection(state);
+                var inspectionResults = inspection.GetInspectionResults(CancellationToken.None);
+
+                Assert.IsFalse(inspectionResults.Any());
+            }
+        }
+
         //https://github.com/rubberduck-vba/Rubberduck/issues/2525
         [Test]
         [Category("Inspections")]