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Rollup merge of #79013 - jryans:cleanup-use-once-pretty-comment, r=Mark-Simulacrum

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Clean up outdated `use_once_payload` pretty printer comment

While reading some parts of the pretty printer code, I noticed this old comment
which seemed out of place. The `use_once_payload` this outdated comment mentions
was removed in 2017 in 40f03a1e0d, so this
completes the work by removing the comment.
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Dylan DPC 2020-11-15 03:03:01 +01:00 committed by GitHub
commit 96515ccc7a
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compiler/rustc_driver/src/pretty.rs
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@ -32,9 +32,6 @@ use crate::abort_on_err;
// Note that since the `&PrinterSupport` is freshly constructed on each
// call, it would not make sense to try to attach the lifetime of `self`
// to the lifetime of the `&PrinterObject`.
//
// (The `use_once_payload` is working around the current lack of once
// functions in the compiler.)
/// Constructs a `PrinterSupport` object and passes it to `f`.
fn call_with_pp_support<'tcx, A, F>(