シングルトンになる条件は書いてあるけど、理由が書いてない…… https://github.com/dotnet/roslyn/blob/8d7908c1a0897b4868e4189dae40a3de42664bf2/src/Compilers/CSharp/Portable/Lowering/LambdaRewriter/ClosureKind.cs
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