Implement ICollection<T> on ArrayBuilder

src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution_ArgsToParameters.cs

@@ -484,7 +484,7 @@ private static bool CanBeOptional(ParameterSymbol parameter, bool isMethodGroupC
 
         private static int? CheckForDuplicateNamedArgument(AnalyzedArguments arguments)
         {
-            if (arguments.Names.IsEmpty())
+            if (arguments.Names.IsEmpty)
             {
                 // No checks if there are no named arguments
                 return null;

src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs

@@ -281,10 +281,10 @@ private static MethodSymbol GetEntryPoint(CSharpCompilation compilation, PEModul
                 Debug.Assert(lazyVariableSlotAllocator is null);
                 Debug.Assert(stateMachineTypeOpt is null);
                 Debug.Assert(codeCoverageSpans.IsEmpty);
-                Debug.Assert(lambdaDebugInfoBuilder.IsEmpty());
-                Debug.Assert(lambdaRuntimeRudeEditsBuilder.IsEmpty());
-                Debug.Assert(closureDebugInfoBuilder.IsEmpty());
-                Debug.Assert(stateMachineStateDebugInfoBuilder.IsEmpty());
+                Debug.Assert(lambdaDebugInfoBuilder.IsEmpty);
+                Debug.Assert(lambdaRuntimeRudeEditsBuilder.IsEmpty);
+                Debug.Assert(closureDebugInfoBuilder.IsEmpty);
+                Debug.Assert(stateMachineStateDebugInfoBuilder.IsEmpty);
 
                 lambdaDebugInfoBuilder.Free();
                 lambdaRuntimeRudeEditsBuilder.Free();

src/Compilers/CSharp/Portable/Lowering/Instrumentation/LocalStateTracingInstrumenter.cs

@@ -111,7 +111,7 @@ public void Close(bool isMethodBody)
 
                 if (isMethodBody)
                 {
-                    Debug.Assert(_lazyPreviousContextVariables?.IsEmpty() != false);
+                    Debug.Assert(_lazyPreviousContextVariables?.IsEmpty != false);
                     _lazyPreviousContextVariables?.Free();
                     _lazyPreviousContextVariables = null;
                 }

src/Compilers/CSharp/Portable/Lowering/StateMachineRewriter/StateMachineRewriter.cs

@@ -49,7 +49,7 @@ protected StateMachineRewriter(
             Debug.Assert(compilationState != null);
             Debug.Assert(diagnostics != null);
             Debug.Assert(diagnostics.DiagnosticBag != null);
-            Debug.Assert(stateMachineStateDebugInfoBuilder.IsEmpty());
+            Debug.Assert(stateMachineStateDebugInfoBuilder.IsEmpty);
 
             this.body = body;
             this.method = method;

src/Compilers/Core/Portable/CodeGen/SwitchIntegralJumpTableEmitter.cs

@@ -194,7 +194,7 @@ private ImmutableArray<SwitchBucket> GenerateSwitchBuckets(int startLabelIndex,
                 //          merge top bucket on stack into newBucket, and pop bucket from stack
                 //      End While
 
-                while (!switchBucketsStack.IsEmpty())
+                while (!switchBucketsStack.IsEmpty)
                 {
                     // get the bucket at top of the stack
                     SwitchBucket prevBucket = switchBucketsStack.Peek();
@@ -217,7 +217,7 @@ private ImmutableArray<SwitchBucket> GenerateSwitchBuckets(int startLabelIndex,
                 curStartLabelIndex++;
             }
 
-            Debug.Assert(!switchBucketsStack.IsEmpty());
+            Debug.Assert(!switchBucketsStack.IsEmpty);
 
             // crumble leaf buckets into degenerate buckets where possible
             var crumbled = ArrayBuilder<SwitchBucket>.GetInstance();

src/Dependencies/PooledObjects/ArrayBuilder.cs

@@ -15,7 +15,7 @@ namespace Microsoft.CodeAnalysis.PooledObjects
 {
     [DebuggerDisplay("Count = {Count,nq}")]
     [DebuggerTypeProxy(typeof(ArrayBuilder<>.DebuggerProxy))]
-    internal sealed partial class ArrayBuilder<T> : IReadOnlyCollection<T>, IReadOnlyList<T>
+    internal sealed partial class ArrayBuilder<T> : IReadOnlyCollection<T>, IReadOnlyList<T>, ICollection<T>
     {
         /// <summary>
         /// See <see cref="Free()"/> for an explanation of this constant value.
@@ -139,6 +139,12 @@ public T this[int index]
             }
         }
 
+        public bool IsReadOnly
+            => false;
+
+        public bool IsEmpty
+            => Count == 0;
+
         /// <summary>
         /// Write <paramref name="value"/> to slot <paramref name="index"/>. 
         /// Fills in unallocated slots preceding the <paramref name="index"/>, if any.

src/Features/Core/Portable/EditAndContinue/AbstractEditAndContinueAnalyzer.cs

@@ -667,7 +667,7 @@ public async Task<DocumentAnalysisResults> AnalyzeDocumentAsync(
             AnalyzeUnchangedActiveMemberBodies(diagnostics, syntacticEdits.Match, newText, oldActiveStatements, newActiveStatementSpans, newActiveStatements, newExceptionRegions, cancellationToken);
             Debug.Assert(newActiveStatements.All(a => a != null));
 
-            if (!diagnostics.IsEmpty())
+            if (!diagnostics.IsEmpty)
             {
                 LogRudeEdits(diagnostics, newText, filePath);
             }
@@ -1117,7 +1117,7 @@ private void AnalyzeChangedMemberBody(
             //    We create syntax map even if it's not necessary: if any data member initializers are active/contain lambdas.
             //    Since initializers are usually simple the map should not be large enough to make it worth optimizing it away.
             var matchingNodes =
-                (!activeNodes.IsEmpty() ||
+                (!activeNodes.IsEmpty ||
                 newStateMachineInfo.HasSuspensionPoints ||
                 newBodyHasLambdas ||
                 IsConstructorWithMemberInitializers(newMember, cancellationToken) ||

src/Features/Core/Portable/EditAndContinue/ActiveStatementsMap.cs

@@ -236,7 +236,7 @@ void AddStatement(LinePositionSpan unmappedLineSpan, ActiveStatement activeState
 
         if (!hasAnyLineDirectives)
         {
-            Debug.Assert(builder.IsEmpty());
+            Debug.Assert(builder.IsEmpty);
 
             if (DocumentPathMap.TryGetValue(oldTree.FilePath, out var activeStatements))
             {

src/Features/Core/Portable/EditAndContinue/EditSession.cs

@@ -825,7 +825,7 @@ public async ValueTask<SolutionUpdate> EmitSolutionUpdateAsync(Solution solution
                 }
 
                 await PopulateChangedAndAddedDocumentsAsync(oldProject, newProject, changedOrAddedDocuments, cancellationToken).ConfigureAwait(false);
-                if (changedOrAddedDocuments.IsEmpty())
+                if (changedOrAddedDocuments.IsEmpty)
                 {
                     continue;
                 }

src/Features/Core/Portable/GenerateConstructorFromMembers/AbstractGenerateConstructorFromMembersCodeRefactoringProvider.cs

@@ -87,7 +87,7 @@ await ComputeRefactoringsAsync(
             intentDataProvider.FallbackOptions,
             cancellationToken).ConfigureAwait(false);
 
-        if (actions.IsEmpty())
+        if (actions.IsEmpty)
         {
             return [];
         }