Fix #3524: Property without backing field cannot have an initializer.

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -100,6 +100,7 @@
     <None Include="TestCases\ILPretty\Issue3442.il" />
     <None Include="TestCases\ILPretty\Issue3466.il" />
     <None Include="testcases\ilpretty\Issue3504.il" />
+    <None Include="testcases\ilpretty\Issue3524.il" />
     <None Include="TestCases\ILPretty\MonoFixed.il" />
     <None Include="TestCases\Correctness\NonGenericConstrainedCallVirt.il" />
     <None Include="TestCases\ILPretty\UnknownTypes.cs" />
@@ -142,6 +143,7 @@
     <Compile Include="TestCases\ILPretty\Issue3421.cs" />
     <Compile Include="TestCases\ILPretty\Issue3442.cs" />
     <Compile Include="TestCases\ILPretty\Issue3466.cs" />
+    <Compile Include="TestCases\ILPretty\Issue3524.cs" />
     <None Include="TestCases\ILPretty\Issue3504.cs" />
     <Compile Include="TestCases\ILPretty\MonoFixed.cs" />
     <Compile Include="TestCases\Pretty\Comparisons.cs" />

ICSharpCode.Decompiler.Tests/ILPrettyTestRunner.cs

@@ -231,6 +231,12 @@ namespace ICSharpCode.Decompiler.Tests
 			await Run();
 		}
 
+		[Test]
+		public async Task Issue3524()
+		{
+			await Run();
+		}
+
 		[Test]
 		public async Task Issue2260SwitchString()
 		{

ICSharpCode.Decompiler.Tests/TestCases/ILPretty/Issue3524.cs

@@ -0,0 +1,14 @@
+public class C
+{
+	public static int X {
+		get {
+			return 32;
+		}
+		set {
+		}
+	}
+	static C()
+	{
+		X = 1;
+	}
+}

ICSharpCode.Decompiler.Tests/TestCases/ILPretty/Issue3524.il

@@ -0,0 +1,77 @@
+.assembly _
+{
+    .custom instance void [System.Runtime]System.Runtime.CompilerServices.CompilationRelaxationsAttribute::.ctor(int32) = (
+        01 00 08 00 00 00 00 00
+    )
+    .custom instance void [System.Runtime]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::.ctor() = (
+        01 00 01 00 54 02 16 57 72 61 70 4e 6f 6e 45 78
+        63 65 70 74 69 6f 6e 54 68 72 6f 77 73 01
+    )
+    .custom instance void [System.Runtime]System.Diagnostics.DebuggableAttribute::.ctor(valuetype [System.Runtime]System.Diagnostics.DebuggableAttribute/DebuggingModes) = (
+        01 00 07 01 00 00 00 00
+    )
+    .hash algorithm 0x00008004 // SHA1
+    .ver 0:0:0:0
+}
+
+.class public auto ansi beforefieldinit C
+    extends [System.Runtime]System.Object
+{
+    // Methods
+    .method public hidebysig specialname static 
+        int32 get_X () cil managed 
+    {
+        // Method begins at RVA 0x2050
+        // Code size 6 (0x6)
+        .maxstack 8
+
+        IL_0000: ldc.i4 32
+        IL_0005: ret
+    } // end of method C::get_X
+
+    .method public hidebysig specialname static 
+        void set_X (
+            int32 'value'
+        ) cil managed 
+    {
+        // Method begins at RVA 0x2058
+        // Code size 1 (0x1)
+        .maxstack 8
+
+        IL_0000: ret
+    } // end of method C::set_X
+
+    .method public hidebysig specialname rtspecialname 
+        instance void .ctor () cil managed 
+    {
+        // Method begins at RVA 0x2068
+        // Code size 8 (0x8)
+        .maxstack 8
+
+        IL_0000: ldarg.0
+        IL_0001: call instance void [System.Runtime]System.Object::.ctor()
+        IL_0006: nop
+        IL_0007: ret
+    } // end of method C::.ctor
+
+    .method private hidebysig specialname rtspecialname static 
+        void .cctor () cil managed 
+    {
+        // Method begins at RVA 0x2074
+        // Code size 11 (0xb)
+        .maxstack 8
+
+        IL_0000: ldc.i4 1
+        IL_0005: call void C::set_X(int32)
+        IL_000a: ret
+    } // end of method C::.cctor
+
+    // Properties
+    .property int32 X()
+    {
+        .get int32 C::get_X()
+        .set void C::set_X(int32)
+    }
+
+} // end of class C
+

ICSharpCode.Decompiler/CSharp/Syntax/TypeMembers/PropertyDeclaration.cs

@@ -82,6 +82,22 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 			set { SetChildByRole(ExpressionBodyRole, value); }
 		}
 
+		public bool IsAutomaticProperty {
+			get {
+				if (!Getter.IsNull && !Getter.Body.IsNull)
+				{
+					return false;
+				}
+
+				if (!Setter.IsNull && !Setter.Body.IsNull)
+				{
+					return false;
+				}
+
+				return true;
+			}
+		}
+
 		public override void AcceptVisitor(IAstVisitor visitor)
 		{
 			visitor.VisitPropertyDeclaration(this);

ICSharpCode.Decompiler/CSharp/Transforms/TransformFieldAndConstructorInitializers.cs

@@ -382,7 +382,7 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 								}
 							}
 						}
-						else if (fieldOrPropertyDecl is PropertyDeclaration pd)
+						else if (fieldOrPropertyDecl is PropertyDeclaration { IsAutomaticProperty: true } pd)
 						{
 							pd.Initializer = assignment.Right.Detach();
 						}