Matthias Krüger
d2db1c1df9
Hide unstable print kinds within emit_unknown_print_request_help in stable channel Fixes #138698 We need to get the channel from `matches`. However, since `matches`(Line 1169) is constructed after `rustc_optgroups` (Line1165, where `RustcOptGroup::value_hint` is generated, i.e. what `rustc --print print` prints), I've left it unchanged here for now. https://github.com/rust-lang/rust/blob/2da29dbe8fe23df1c7c4ab1d8740ca3c32b15526/compiler/rustc_driver_impl/src/lib.rs#L1161-L1169 There is actually a way to manually parse the `--crate-name` parameter, but I'm afraid that's an unorthodox practice. So I conservatively just modified `emit_unknown_print_request_help` to print different parameters depending on whether they are nightly or not when passing the error parameter. r? ```@jieyouxu```
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