inline some out variables

Author: SimonCropp

src/Microsoft.OpenApi.Readers/ParseNodes/MapNode.cs

@@ -47,8 +47,7 @@ public PropertyNode this[string key]
         {
             get
             {
-                YamlNode node;
-                if (this._node.Children.TryGetValue(new YamlScalarNode(key), out node))
+                if (this._node.Children.TryGetValue(new YamlScalarNode(key), out var node))
                 {
                     return new PropertyNode(Context, key, node);
                 }
@@ -193,9 +192,7 @@ public T GetReferencedObject<T>(ReferenceType referenceType, string referenceId)
 
         public string GetReferencePointer()
         {
-            YamlNode refNode;
-
-            if (!_node.Children.TryGetValue(new YamlScalarNode("$ref"), out refNode))
+            if (!_node.Children.TryGetValue(new YamlScalarNode("$ref"), out var refNode))
             {
                 return null;
             }

src/Microsoft.OpenApi.Readers/ParseNodes/PropertyNode.cs

@@ -30,8 +30,7 @@ public void ParseField<T>(
             IDictionary<string, Action<T, ParseNode>> fixedFields,
             IDictionary<Func<string, bool>, Action<T, string, ParseNode>> patternFields)
         {
-            Action<T, ParseNode> fixedFieldMap;
-            var found = fixedFields.TryGetValue(Name, out fixedFieldMap);
+            var found = fixedFields.TryGetValue(Name, out var fixedFieldMap);
 
             if (fixedFieldMap != null)
             {

src/Microsoft.OpenApi.Readers/ParsingContext.cs

@@ -206,8 +206,7 @@ public void StartObject(string objectName)
         /// <returns>If method returns false a loop was detected and the key is not added.</returns>
         public bool PushLoop(string loopId, string key)
         {
-            Stack<string> stack;
-            if (!_loopStacks.TryGetValue(loopId, out stack))
+            if (!_loopStacks.TryGetValue(loopId, out var stack))
             {
                 stack = new Stack<string>();
                 _loopStacks.Add(loopId, stack);

src/Microsoft.OpenApi/Services/LoopDetector.cs

@@ -17,8 +17,7 @@ internal class LoopDetector
         /// <returns>If method returns false a loop was detected and the key is not added.</returns>
         public bool PushLoop<T>(T key)
         {
-            Stack<object> stack;
-            if (!_loopStacks.TryGetValue(typeof(T), out stack))
+            if (!_loopStacks.TryGetValue(typeof(T), out var stack))
             {
                 stack = new Stack<object>();
                 _loopStacks.Add(typeof(T), stack);

src/Microsoft.OpenApi/Validations/ValidationRuleSet.cs

@@ -30,8 +30,7 @@ public sealed class ValidationRuleSet : IEnumerable<ValidationRule>
         /// <returns>Either the rules related to the type, or an empty list.</returns>
         public IList<ValidationRule> FindRules(Type type)
         {
-            IList<ValidationRule> results = null;
-            _rules.TryGetValue(type, out results);
+            _rules.TryGetValue(type, out var results);
             return results ?? _emptyRules;
         }
 

test/Microsoft.OpenApi.Readers.Tests/V2Tests/OpenApiContactTests.cs

@@ -21,10 +21,9 @@ public void ParseStringContactFragmentShouldSucceed()
 }
 ";
             var reader = new OpenApiStringReader();
-            var diagnostic = new OpenApiDiagnostic();
 
             // Act
-            var contact = reader.ReadFragment<OpenApiContact>(input, OpenApiSpecVersion.OpenApi2_0, out diagnostic);
+            var contact = reader.ReadFragment<OpenApiContact>(input, OpenApiSpecVersion.OpenApi2_0, out var diagnostic);
 
             // Assert
             diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());

test/Microsoft.OpenApi.Readers.Tests/V3Tests/OpenApiContactTests.cs

@@ -21,10 +21,9 @@ public void ParseStringContactFragmentShouldSucceed()
 }
 ";
             var reader = new OpenApiStringReader();
-            var diagnostic = new OpenApiDiagnostic();
 
             // Act
-            var contact = reader.ReadFragment<OpenApiContact>(input, OpenApiSpecVersion.OpenApi3_0, out diagnostic);
+            var contact = reader.ReadFragment<OpenApiContact>(input, OpenApiSpecVersion.OpenApi3_0, out var diagnostic);
 
             // Assert
             diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());

test/Microsoft.OpenApi.Readers.Tests/V3Tests/OpenApiSchemaTests.cs

@@ -54,10 +54,9 @@ public void ParsePrimitiveSchemaFragmentShouldSucceed()
             using (var stream = Resources.GetStream(Path.Combine(SampleFolderPath, "primitiveSchema.yaml")))
             {
                 var reader = new OpenApiStreamReader();
-                var diagnostic = new OpenApiDiagnostic();
 
                 // Act
-                var schema = reader.ReadFragment<OpenApiSchema>(stream, OpenApiSpecVersion.OpenApi3_0, out diagnostic);
+                var schema = reader.ReadFragment<OpenApiSchema>(stream, OpenApiSpecVersion.OpenApi3_0, out var diagnostic);
 
                 // Assert
                 diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());
@@ -81,10 +80,9 @@ public void ParsePrimitiveStringSchemaFragmentShouldSucceed()
 }
 ";
             var reader = new OpenApiStringReader();
-            var diagnostic = new OpenApiDiagnostic();
 
             // Act
-            var schema = reader.ReadFragment<OpenApiSchema>(input, OpenApiSpecVersion.OpenApi3_0, out diagnostic);
+            var schema = reader.ReadFragment<OpenApiSchema>(input, OpenApiSpecVersion.OpenApi3_0, out var diagnostic);
 
             // Assert
             diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());
@@ -107,10 +105,9 @@ public void ParseExampleStringFragmentShouldSucceed()
   ""baz"": [ 1,2]
 }";
             var reader = new OpenApiStringReader();
-            var diagnostic = new OpenApiDiagnostic();
 
             // Act
-            var openApiAny = reader.ReadFragment<IOpenApiAny>(input, OpenApiSpecVersion.OpenApi3_0, out diagnostic);
+            var openApiAny = reader.ReadFragment<IOpenApiAny>(input, OpenApiSpecVersion.OpenApi3_0, out var diagnostic);
 
             // Assert
             diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());
@@ -135,10 +132,9 @@ public void ParseEnumFragmentShouldSucceed()
   ""baz""
 ]";
             var reader = new OpenApiStringReader();
-            var diagnostic = new OpenApiDiagnostic();
 
             // Act
-            var openApiAny = reader.ReadFragment<IOpenApiAny>(input, OpenApiSpecVersion.OpenApi3_0, out diagnostic);
+            var openApiAny = reader.ReadFragment<IOpenApiAny>(input, OpenApiSpecVersion.OpenApi3_0, out var diagnostic);
 
             // Assert
             diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());
@@ -212,10 +208,9 @@ public void ParsePathFragmentShouldSucceed()
       description: Ok
 ";
             var reader = new OpenApiStringReader();
-            var diagnostic = new OpenApiDiagnostic();
 
             // Act
-            var openApiAny = reader.ReadFragment<OpenApiPathItem>(input, OpenApiSpecVersion.OpenApi3_0, out diagnostic);
+            var openApiAny = reader.ReadFragment<OpenApiPathItem>(input, OpenApiSpecVersion.OpenApi3_0, out var diagnostic);
 
             // Assert
             diagnostic.Should().BeEquivalentTo(new OpenApiDiagnostic());