lifetime extension: mention how projections are handled #63
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This is based on reading the following code:
https://github.com/rust-lang/rust/blob/c4926d01ada661d4fbffb0e5b1708ae5463d47b3/compiler/rustc_mir/src/transform/promote_consts.rs#L1008
and based on the fact that promoted projections can contain array/slice indexing depending on runtime values.