What is the purpose of `body` attribute?

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1

I was shared this weird behavior in Nix:

❯ nix repl
Nix 2.31.3
Type :? for help.
nix-repl> let { x = "howdy"; body = x; }
"howdy"
nix-repl> let { body = "howdy"; }
"howdy"

What’s the purpose of this behavior?

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2

Legacy let syntax.

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