Fix unit tests.

ICSharpCode.Decompiler.Tests/Helpers/Tester.cs

@@ -241,9 +241,6 @@ namespace ICSharpCode.Decompiler.Tests.Helpers
 					));
 				CompilerResults results = new CompilerResults(new TempFileCollection());
 				results.PathToAssembly = outputFileName ?? Path.GetTempFileName();
-				string systemMemoryDestPath = Path.Combine(Path.GetDirectoryName(results.PathToAssembly), Path.GetFileName(typeof(Span<>).Assembly.Location));
-				if (!File.Exists(systemMemoryDestPath))
-					File.Copy(typeof(Span<>).Assembly.Location, systemMemoryDestPath);
 				var emitResult = compilation.Emit(results.PathToAssembly);
 				if (!emitResult.Success) {
 					StringBuilder b = new StringBuilder("Compiler error:");
@@ -406,6 +403,7 @@ namespace ICSharpCode.Decompiler.Tests.Helpers
 				var module = new PEFile(assemblyFileName, file, PEStreamOptions.PrefetchEntireImage);
 				var resolver = new UniversalAssemblyResolver(assemblyFileName, false,
 					module.Reader.DetectTargetFrameworkId(), PEStreamOptions.PrefetchMetadata);
+				resolver.AddSearchDirectory(Path.GetDirectoryName(typeof(Span<>).Assembly.Location));
 				var typeSystem = new DecompilerTypeSystem(module, resolver, settings);
 				CSharpDecompiler decompiler = new CSharpDecompiler(typeSystem, settings);
 				decompiler.AstTransforms.Insert(0, new RemoveEmbeddedAtttributes());

ICSharpCode.Decompiler/CSharp/ExpressionBuilder.cs

@@ -2287,6 +2287,11 @@ namespace ICSharpCode.Decompiler.CSharp
 				throw new ArgumentException("given Block is invalid!");
 			StackAllocExpression stackAllocExpression;
 			IType elementType;
+			if (block.Instructions.Count < 2 || !block.Instructions[1].MatchStObj(out _, out _, out var t))
+				throw new ArgumentException("given Block is invalid!");
+			if (typeHint is PointerType pt && !TypeUtils.IsCompatibleTypeForMemoryAccess(t, pt.ElementType)) {
+				typeHint = new PointerType(t);
+			}
 			switch (stloc.Value) {
 				case LocAlloc locAlloc:
 					stackAllocExpression = TranslateLocAlloc(locAlloc, typeHint, out elementType);
@@ -2303,7 +2308,7 @@ namespace ICSharpCode.Decompiler.CSharp
 
 			for (int i = 1; i < block.Instructions.Count; i++) {
 				// stobj type(binary.add.i(ldloc I_0, conv i4->i <sign extend> (ldc.i4 offset)), value)
-				if (!block.Instructions[i].MatchStObj(out var target, out var value, out var t) || !TypeUtils.IsCompatibleTypeForMemoryAccess(elementType, t))
+				if (!block.Instructions[i].MatchStObj(out var target, out var value, out t) || !TypeUtils.IsCompatibleTypeForMemoryAccess(elementType, t))
 					throw new ArgumentException("given Block is invalid!");
 				long offset = 0;
 				target = target.UnwrapConv(ConversionKind.StopGCTracking);