---

This section details on the original issue you should resolve

<issue_title>JsonSourceGenerator misinterprets @ verbatim identifiers.</issue_title>
<issue_description>### Description

JsonSourceGenerator does not correctly handle C# verbatim identifiers and confuses them during code generation.

Reproduction Steps

$ cat <<EOF | dotnet run -
using System.Text.Json;
using System.Text.Json.Serialization;
Console.Write(JsonSerializer.Deserialize("""{"else":{}}""",Ctx.Default.A));
[JsonSerializable(typeof(A))] partial class Ctx : JsonSerializerContext;
record A { public A? @else { get; init; } }
EOF
~/System.Text.Json.SourceGeneration/System.Text.Json.SourceGeneration.JsonSourceGenerator/Ctx.A.g.cs(41,9): error CS8802: Only one compilation unit can have top-level statements.

The build failed. Fix the build errors and run again.

Expected behavior

$ cat <<EOF | dotnet run -
using System.Text.Json;
using System.Text.Json.Serialization;
Console.Write(JsonSerializer.Deserialize("""{"else":{}}""",Ctx.Default.A));
[JsonSerializable(typeof(A))] partial class Ctx : JsonSerializerContext;
record A { public A? @else { get; init; } }
EOF
A { else = A { else =  } }

Actual behavior

.

Regression?

No response

Known Workarounds

$ cat <<EOF | dotnet run -
#:property PublishAot=false
using System.Text.Json;
Console.Write(JsonSerializer.Deserialize<A>("""{"else":{}}"""));
record A { public A? @else { get; init; } }
EOF
A { else = A { else =  } }

$ cat <<EOF | dotnet run -
using System.Text.Json;
using System.Text.Json.Serialization;
Console.Write(JsonSerializer.Deserialize("""{"else":{}}""",Ctx.Default.A));
[JsonSerializable(typeof(A))] partial class Ctx : JsonSerializerContext;
record A { [JsonPropertyName("else")] public A? Else { get; init; } }
EOF
A { Else = A { Else =  } }

Configuration

$ dotnet --version
10.0.100

Other information

No response</issue_description>

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