2.0 TagHelper error: A local or parameter named '__model' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter

[GarageWeb]

Starting with a default core 2.0 project, you get an error if you render a section from a layout in a view with an InputTagHelper. If you RenderBody in the layout instead, no issue.

Here is a super bare bones project illustrating the issue: https://github.com/GarageWeb/ModelErrorExample

error: A local or parameter named '__model' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter

#pragma checksum "C:\Users\mrfle\source\repos\ModelErrorExample\ModelErrorExample\Views\Home\Index.cshtml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "1e27cfed358ff1c6a2d2bf68cb93678d6cdc3273"
// <auto-generated/>
#pragma warning disable 1591
[assembly:global::Microsoft.AspNetCore.Mvc.Razor.Compilation.RazorViewAttribute(@"/Views/Home/Index.cshtml", typeof(AspNetCore._Views_Home_Index_cshtml))]
namespace AspNetCore
{
    #line hidden
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore.Mvc;
    using Microsoft.AspNetCore.Mvc.Rendering;
    using Microsoft.AspNetCore.Mvc.ViewFeatures;
#line 1 "C:\Users\mrfle\source\repos\ModelErrorExample\ModelErrorExample\Views\_ViewImports.cshtml"
using ModelErrorExample;

#line default
#line hidden
#line 2 "C:\Users\mrfle\source\repos\ModelErrorExample\ModelErrorExample\Views\_ViewImports.cshtml"
using ModelErrorExample.Models;

#line default
#line hidden
    public class _Views_Home_Index_cshtml : global::Microsoft.AspNetCore.Mvc.Razor.RazorPage<PasswordNewViewData>
    {
        private static readonly global::Microsoft.AspNetCore.Razor.TagHelpers.TagHelperAttribute __tagHelperAttribute_0 = new global::Microsoft.AspNetCore.Razor.TagHelpers.TagHelperAttribute("action", new global::Microsoft.AspNetCore.Html.HtmlString("/"), global::Microsoft.AspNetCore.Razor.TagHelpers.HtmlAttributeValueStyle.DoubleQuotes);
        private static readonly global::Microsoft.AspNetCore.Razor.TagHelpers.TagHelperAttribute __tagHelperAttribute_1 = new global::Microsoft.AspNetCore.Razor.TagHelpers.TagHelperAttribute("method", "post", global::Microsoft.AspNetCore.Razor.TagHelpers.HtmlAttributeValueStyle.DoubleQuotes);
        #line hidden
        #pragma warning disable 0169
        private string __tagHelperStringValueBuffer;
        #pragma warning restore 0169
        private global::Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext __tagHelperExecutionContext;
        private global::Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner __tagHelperRunner = new global::Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner();
        private global::Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperScopeManager __backed__tagHelperScopeManager = null;
        private global::Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperScopeManager __tagHelperScopeManager
        {
            get
            {
                if (__backed__tagHelperScopeManager == null)
                {
                    __backed__tagHelperScopeManager = new global::Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperScopeManager(StartTagHelperWritingScope, EndTagHelperWritingScope);
                }
                return __backed__tagHelperScopeManager;
            }
        }
        private global::Microsoft.AspNetCore.Mvc.TagHelpers.FormTagHelper __Microsoft_AspNetCore_Mvc_TagHelpers_FormTagHelper;
        private global::Microsoft.AspNetCore.Mvc.TagHelpers.RenderAtEndOfFormTagHelper __Microsoft_AspNetCore_Mvc_TagHelpers_RenderAtEndOfFormTagHelper;
        private global::Microsoft.AspNetCore.Mvc.TagHelpers.InputTagHelper __Microsoft_AspNetCore_Mvc_TagHelpers_InputTagHelper;
        #pragma warning disable 1998
        public async override global::System.Threading.Tasks.Task ExecuteAsync()
        {
#line 2 "C:\Users\mrfle\source\repos\ModelErrorExample\ModelErrorExample\Views\Home\Index.cshtml"
  
    Layout = "~/Views/Shared/_Layout_Minimal.cshtml";

#line default
#line hidden
            DefineSection("TestSection", async() => {
                BeginContext(111, 8, true);
                WriteLiteral(" \r\n\r\n   ");
                EndContext();
                BeginContext(119, 126, false);
                __tagHelperExecutionContext = __tagHelperScopeManager.Begin("form", global::Microsoft.AspNetCore.Razor.TagHelpers.TagMode.StartTagAndEndTag, "678168d95b154e489a7e6e885b456a3a", async() => {
                    BeginContext(150, 9, true);
                    BeginContext(150, 9, true);
                    WriteLiteral("\r\n       ");
                    EndContext();
                    EndContext();
                    BeginContext(159, 32, false);
                    BeginContext(159, 32, false);
                    __tagHelperExecutionContext = __tagHelperScopeManager.Begin("input", global::Microsoft.AspNetCore.Razor.TagHelpers.TagMode.SelfClosing, "d5fa4ad0555f43318a097b11cb90a438", async() => {
                    }
                    );
                    __Microsoft_AspNetCore_Mvc_TagHelpers_InputTagHelper = CreateTagHelper<global::Microsoft.AspNetCore.Mvc.TagHelpers.InputTagHelper>();
                    __tagHelperExecutionContext.Add(__Microsoft_AspNetCore_Mvc_TagHelpers_InputTagHelper);
#line 8 "C:\Users\mrfle\source\repos\ModelErrorExample\ModelErrorExample\Views\Home\Index.cshtml"
__Microsoft_AspNetCore_Mvc_TagHelpers_InputTagHelper.For = ModelExpressionProvider.CreateModelExpression(ViewData, __model => ModelExpressionProvider.CreateModelExpression(ViewData, __model => __model.EmailAddress));

#line default
#line hidden
                    __tagHelperExecutionContext.AddTagHelperAttribute("asp-for", __Microsoft_AspNetCore_Mvc_TagHelpers_InputTagHelper.For, global::Microsoft.AspNetCore.Razor.TagHelpers.HtmlAttributeValueStyle.DoubleQuotes);
                    await __tagHelperRunner.RunAsync(__tagHelperExecutionContext);
                    if (!__tagHelperExecutionContext.Output.IsContentModified)
                    {
                        await __tagHelperExecutionContext.SetOutputContentAsync();
                    }
                    Write(__tagHelperExecutionContext.Output);
                    __tagHelperExecutionContext = __tagHelperScopeManager.End();
                    EndContext();
                    EndContext();
                    BeginContext(191, 47, true);
                    BeginContext(191, 47, true);
                    WriteLiteral("\r\n        <button type=\"submit\"></button>\r\n    ");
                    EndContext();
                    EndContext();
                }
                );
                __Microsoft_AspNetCore_Mvc_TagHelpers_FormTagHelper = CreateTagHelper<global::Microsoft.AspNetCore.Mvc.TagHelpers.FormTagHelper>();
                __tagHelperExecutionContext.Add(__Microsoft_AspNetCore_Mvc_TagHelpers_FormTagHelper);
                __Microsoft_AspNetCore_Mvc_TagHelpers_RenderAtEndOfFormTagHelper = CreateTagHelper<global::Microsoft.AspNetCore.Mvc.TagHelpers.RenderAtEndOfFormTagHelper>();
                __tagHelperExecutionContext.Add(__Microsoft_AspNetCore_Mvc_TagHelpers_RenderAtEndOfFormTagHelper);
                __tagHelperExecutionContext.AddHtmlAttribute(__tagHelperAttribute_0);
                __Microsoft_AspNetCore_Mvc_TagHelpers_FormTagHelper.Method = (string)__tagHelperAttribute_1.Value;
                __tagHelperExecutionContext.AddTagHelperAttribute(__tagHelperAttribute_1);
                await __tagHelperRunner.RunAsync(__tagHelperExecutionContext);
                if (!__tagHelperExecutionContext.Output.IsContentModified)
                {
                    await __tagHelperExecutionContext.SetOutputContentAsync();
                }
                Write(__tagHelperExecutionContext.Output);
                __tagHelperExecutionContext = __tagHelperScopeManager.End();
                EndContext();
                BeginContext(245, 4, true);
                WriteLiteral("\r\n\r\n");
                EndContext();
            }
            );
            BeginContext(252, 2, true);
            WriteLiteral("\r\n");
            EndContext();
        }
        #pragma warning restore 1998
        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
        public global::Microsoft.AspNetCore.Mvc.ViewFeatures.IModelExpressionProvider ModelExpressionProvider { get; private set; }
        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
        public global::Microsoft.AspNetCore.Mvc.IUrlHelper Url { get; private set; }
        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
        public global::Microsoft.AspNetCore.Mvc.IViewComponentHelper Component { get; private set; }
        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
        public global::Microsoft.AspNetCore.Mvc.Rendering.IJsonHelper Json { get; private set; }
        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
        public global::Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<PasswordNewViewData> Html { get; private set; }
    }
}
#pragma warning restore 1591

[GarageWeb]

Also, adding RenderBody() in addition to the section does not change the outcome.

[pranavkm]

cc @NTaylorMullen \ @ajaybhargavb

[NTaylorMullen]

Investigating.

[NTaylorMullen]

This issue was moved to aspnet/Razor#1614