Repro for dotnet/runtime#50757

Bug50757/Bug50757.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30709.64
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Bug50757", "Bug50757\Bug50757.csproj", "{744FF869-BFA0-4D69-89B2-DBC9AFE1DF2A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{744FF869-BFA0-4D69-89B2-DBC9AFE1DF2A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{744FF869-BFA0-4D69-89B2-DBC9AFE1DF2A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{744FF869-BFA0-4D69-89B2-DBC9AFE1DF2A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{744FF869-BFA0-4D69-89B2-DBC9AFE1DF2A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A5ADCCFE-043A-4C65-921C-AA5496CF24AB}
+	EndGlobalSection
+EndGlobal

Bug50757/Bug50757/Bug50757.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+	<PropertyGroup>
+		<TargetFramework>net5.0</TargetFramework>
+		<ApplicationIcon />
+		<OutputType>Exe</OutputType>
+		<StartupObject />
+		<WasmShellMonoRuntimeExecutionMode>InterpreterAndAOT</WasmShellMonoRuntimeExecutionMode>
+		<WasmShellEnableEmccProfiling>true</WasmShellEnableEmccProfiling>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<LinkerDescriptor Include="Linker.xml" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Uno.Wasm.Bootstrap" Version="2.1.0-dev.45" />
+		<PackageReference Include="Uno.Wasm.Bootstrap.DevServer" Version="2.1.0-dev.45" />
+	</ItemGroup>
+</Project>

Bug50757/Bug50757/Linker.xml

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+<linker>
+	<assembly fullname="Bug50757"/>
+</linker>

Bug50757/Bug50757/Program.cs

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+using System;
+using System.Diagnostics;
+
+namespace Uno.Wasm.Sample
+{
+    public static class Program
+    {
+        static void Main(string[] args)
+        {
+            TestRegisterColor();
+            TestRegisterOther();
+        }
+
+private static void TestRegisterColor()
+{
+    var sw = Stopwatch.StartNew();
+    int value = 0;
+    for (int i = 0; i < 10000000; i++)
+    {
+        RegisterColor(null, c => value++);
+    }
+    sw.Stop();
+    Console.WriteLine($"Color: {sw.ElapsedMilliseconds}");
+}
+
+private static void TestRegisterOther()
+{
+    var sw = Stopwatch.StartNew();
+    int value = 0;
+    for (int i = 0; i < 10000000; i++)
+    {
+        RegisterOther(null, c => value++);
+    }
+    sw.Stop();
+    Console.WriteLine($"Other: {sw.ElapsedMilliseconds}");
+}
+
+private static void RegisterColor(object o, Action<Color> action)
+{
+    action(new Color());
+}
+
+private static void RegisterOther(object o, Action<IDisposable> action)
+{
+    action(null);
+}
+    }
+
+public partial struct Color : IFormattable
+{
+    public byte A { get; set; }
+
+    public byte B { get; set; }
+
+    public byte G { get; set; }
+
+        public byte R { get; set; }
+
+        internal bool IsTransparent => A == 0;
+
+        public static Color FromArgb(byte a, byte r, byte g, byte b) => new Color(a, r, g, b);
+
+        private Color(byte a, byte r, byte g, byte b)
+        {
+            A = a;
+            R = r;
+            G = g;
+            B = b;
+        }
+
+        public override bool Equals(object o) => o is Color color && Equals(color);
+
+        public bool Equals(Color color) =>
+            color.A == A
+            && color.R == R
+            && color.G == G
+            && color.B == B;
+
+        public override int GetHashCode() => (A << 8) ^ (R << 6) ^ (G << 4) ^ B;
+
+        public override string ToString() => $"[Color: {A:X8};{R:X8};{G:X8};{B:X8}]";
+
+        public string ToString(string format, IFormatProvider provider) => ToString();
+
+        public static bool operator ==(Color color1, Color color2) => color1.Equals(color2);
+
+        public static bool operator !=(Color color1, Color color2) => !color1.Equals(color2);
+
+        internal Color WithOpacity(double opacity) => new Color((byte)(A * opacity), R, G, B);
+    }
+}

Bug50757/Bug50757/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:49943/",
+      "sslPort": 44344
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Bug44269": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "http://localhost:5000"
+    }
+  }
+}

Bug50757/Bug50757/README.md

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+# Repro for issue https://github.com/dotnet/runtime/issues/50757
+
+Reproducing this requires .NET 5 RC1 or later, mono and ninja installed.
+
+Build with `dotnet build`
+
+The SDK files are located in %TMP/dotnet-runtime-wasm-XXX

Bug50757/Bug50757/Resources/Strings.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="MyDefaultString" xml:space="preserve">
+    <value>test en-US</value>
+  </data>
+</root>