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Richard Smith
74d52738ff
A `let` declaration is represented by a `bind_name` node in SemIR: ```carbon-semir %b: i32 = bind_name "b", %a ``` Because `Check` encounters the pattern before it sees the value, we first create the `bind_name` node with an unset value and don't add it to the block. Then, once we've seen and converted the initializer, we update the `bind_name` to have the value and add it to the current block, after the initializer code.