Remove the notion of making decisions based on being within a method without a block.

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

@@ -25,7 +25,6 @@ internal sealed class DynamicAnalysisInjector : CompoundInstrumenter
         private readonly LocalSymbol _methodPayload;
         private readonly DiagnosticBag _diagnostics;
         private readonly DebugDocumentProvider _debugDocumentProvider;
-        private readonly bool _methodHasExplicitBlock;
         private readonly SyntheticBoundNodeFactory _methodBodyFactory;
 
         public static DynamicAnalysisInjector TryCreate(MethodSymbol method, BoundStatement methodBody, SyntheticBoundNodeFactory methodBodyFactory, DiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, Instrumenter previous)
@@ -60,7 +59,6 @@ private DynamicAnalysisInjector(MethodSymbol method, BoundStatement methodBody,
             _methodPayload = methodBodyFactory.SynthesizedLocal(_payloadType, kind: SynthesizedLocalKind.InstrumentationPayload, syntax: methodBody.Syntax);
             _diagnostics = diagnostics;
             _debugDocumentProvider = debugDocumentProvider;
-            _methodHasExplicitBlock = MethodHasExplicitBlock(method);
             _methodBodyFactory = methodBodyFactory;
 
             // The first point indicates entry into the method and has the span of the method definition.
@@ -139,15 +137,7 @@ public override BoundStatement InstrumentContinueStatement(BoundContinueStatemen
 
         public override BoundStatement InstrumentExpressionStatement(BoundExpressionStatement original, BoundStatement rewritten)
         {
-            rewritten = base.InstrumentExpressionStatement(original, rewritten);
-
-            if (!_methodHasExplicitBlock)
-            {
-                // The assignment statement for a property set method defined without a block is compiler generated, but requires instrumentation.
-                return CollectDynamicAnalysis(original, rewritten);
-            }
-
-            return AddDynamicAnalysis(original, rewritten);
+            return AddDynamicAnalysis(original, base.InstrumentExpressionStatement(original, rewritten));
         }
 
         public override BoundStatement InstrumentFieldOrPropertyInitializer(BoundExpressionStatement original, BoundStatement rewritten)
@@ -210,8 +200,10 @@ public override BoundStatement InstrumentReturnStatement(BoundReturnStatement or
             rewritten = base.InstrumentReturnStatement(original, rewritten);
 
             // A synthesized return statement that does not return a value never requires instrumentation.
-            // A property set method defined without a block has such a synthesized return statement.
-            if ((!_methodHasExplicitBlock || _methodBodyFactory.CurrentMethod.MethodKind == MethodKind.LambdaMethod) && ((BoundReturnStatement)original).ExpressionOpt != null)
+            // A property set defined without a block has such a synthesized return statement.
+            // A synthesized return statement that does return a value does require instrumentation.
+            // A method, property get, or lambda defined without a block has such a synthesized return statement.
+            if (ReturnsValueWithinExpressionBodiedConstruct(original))
             {
                 // The return statement for value-returning methods defined without a block is compiler generated, but requires instrumentation.
                 return CollectDynamicAnalysis(original, rewritten);
@@ -220,6 +212,25 @@ public override BoundStatement InstrumentReturnStatement(BoundReturnStatement or
             return AddDynamicAnalysis(original, rewritten);
         }
         
+        private static bool ReturnsValueWithinExpressionBodiedConstruct(BoundReturnStatement returnStatement)
+        {
+            if (returnStatement.WasCompilerGenerated &&
+                returnStatement.ExpressionOpt != null &&
+                returnStatement.ExpressionOpt.Syntax != null)
+            {
+                SyntaxKind parentKind = returnStatement.ExpressionOpt.Syntax.Parent.Kind();
+                switch (parentKind)
+                {
+                    case SyntaxKind.ParenthesizedLambdaExpression:
+                    case SyntaxKind.SimpleLambdaExpression:
+                    case SyntaxKind.ArrowExpressionClause:
+                        return true;
+                }
+            }
+
+            return false;
+        }
+
         public override BoundStatement InstrumentSwitchStatement(BoundSwitchStatement original, BoundStatement rewritten)
         {
             return AddDynamicAnalysis(original, base.InstrumentSwitchStatement(original, rewritten));
@@ -351,17 +362,6 @@ private static SyntaxNode SyntaxForSpan(BoundStatement statement)
             return syntaxForSpan;
         }
         
-        private static bool MethodHasExplicitBlock(MethodSymbol method)
-        {
-            SourceMethodSymbol asSourceMethod = method.OriginalDefinition as SourceMethodSymbol;
-            if ((object)asSourceMethod != null)
-            {
-                return asSourceMethod.BodySyntax is BlockSyntax;
-            }
-
-            return false;
-        }
-
         private static MethodSymbol GetCreatePayload(CSharpCompilation compilation, SyntaxNode syntax, DiagnosticBag diagnostics)
         {
             return (MethodSymbol)Binder.GetWellKnownTypeMember(compilation, WellKnownMember.Microsoft_CodeAnalysis_Runtime_Instrumentation__CreatePayload, diagnostics, syntax: syntax);

src/Compilers/CSharp/Test/Emit/Emit/DynamicAnalysis/DynamicAnalysisResourceTests.cs

@@ -53,6 +53,8 @@ public static int Wilma
     }
 
     public static int Betty { get; }
+
+    public static int Pebbles { get; set; }
 }
 ";
 
@@ -66,9 +68,9 @@ public void TestSpansPresentInResource()
             var reader = DynamicAnalysisDataReader.TryCreateFromPE(peReader, "<DynamicAnalysisData>");
 
             VerifyDocuments(reader, reader.Documents,
-                @"'C:\myproject\doc1.cs' B2-C1-91-21-17-72-39-D7-D8-C8-AC-3C-09-F6-3C-FF-B7-E5-97-8E (SHA1)");
+                @"'C:\myproject\doc1.cs' FF-9A-1F-F4-03-A5-A1-F7-8D-CD-00-15-67-0E-BA-F7-23-9D-3F-0F (SHA1)");
 
-            Assert.Equal(10, reader.Methods.Length);
+            Assert.Equal(12, reader.Methods.Length);
 
             string[] sourceLines = ExampleSource.Split('\n');
 
@@ -96,7 +98,15 @@ public void TestSpansPresentInResource()
                 new SpanResult(21, 4, 21, 36, "public static int Betty { get; }"),
                 new SpanResult(21, 30, 21, 34, "get"));
 
-            VerifySpans(reader, reader.Methods[6]);
+            VerifySpans(reader, reader.Methods[6], sourceLines,                         // Pebbles get
+                new SpanResult(23, 4, 23, 43, "public static int Pebbles { get; set; }"),
+                new SpanResult(23, 32, 23, 36, "get"));
+
+            VerifySpans(reader, reader.Methods[7], sourceLines,                         // Pebbles set
+                new SpanResult(23, 4, 23, 43, "public static int Pebbles { get; set; }"),
+                new SpanResult(23, 37, 23, 41, "set"));
+
+            VerifySpans(reader, reader.Methods[8]);
         }
 
         [Fact]
@@ -834,6 +844,18 @@ void L1()
             );
 
             f();
+
+            var f1 = new Func<int>(
+                () => { return 2; }
+            );
+
+            var f2 = new Func<int, int>(
+                (x) => x + 3
+            );
+
+            var f3 = new Func<int, int>(
+                x => x + 4
+            );
         }
     }
 }
@@ -856,11 +878,17 @@ void L1()
                 new SpanResult(12, 8, 12, 21, "new D().M1()"));
 
             VerifySpans(reader, reader.Methods[3], sourceLines,
-                new SpanResult(18, 4, 29, 5, "public void M1()"),
+                new SpanResult(18, 4, 41, 5, "public void M1()"),
                 new SpanResult(20, 8, 20, 13, "L1()"),
                 new SpanResult(24, 22, 24, 23, "1"),
                 new SpanResult(23, 12, 25, 14, "var f = new Func<int>"),
-                new SpanResult(27, 12, 27, 16, "f()"));
+                new SpanResult(27, 12, 27, 16, "f()"),
+                new SpanResult(30, 24, 30, 33, "return 2"),
+                new SpanResult(29, 12, 31, 14, "var f1 = new Func<int>"),
+                new SpanResult(34, 23, 34, 28, "x + 3"),
+                new SpanResult(33, 12, 35, 14, "var f2 = new Func<int, int>"),
+                new SpanResult(38, 21, 38, 26, "x + 4"),
+                new SpanResult(37, 12, 39, 14, "var f3 = new Func<int, int>"));
         }
 
         [Fact]

src/Compilers/CSharp/Test/Emit/Emit/DynamicAnalysis/DynamicInstrumentationTests.cs

@@ -891,10 +891,19 @@ void L1()
             );
 
             var f1 = new Func<int>(
-                () => 1
+                () => 2
+            );
+
+            var f2 = new Func<int, int>(
+                (x) => x + 3
+            );
+
+            var f3 = new Func<int, int>(
+                x => x + 4
             );
 
             f();
+            f3(2);
         }
     }
 
@@ -920,6 +929,11 @@ File 1
 True
 False
 True
+False
+True
+True
+True
+True
 True
 Method 5
 File 1