unnested_or_patterns does not respect clippy.toml msrv

[dtolnay]

Repro:

# .clippy.toml

msrv = "1.31.0"

// src/main.rs

#![deny(clippy::pedantic)]

enum E {
    A,
    #[allow(dead_code)]
    B,
}

fn main() {
    match E::A {
        e @ E::A | e @ E::B => {
            let _ = e;
        }
    }

    match E::A {
        e @ (E::A | E::B) => {
            let _ = e;
        }
    }
}

cargo clippy emits a unnested_or_patterns lint, despite that syntax not being valid on Rust 1.31.0.

error: unnested or-patterns
  --> src/main.rs:11:9
   |
11 |         e @ E::A | e @ E::B => {
   |         ^^^^^^^^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> src/main.rs:1:9
   |
1  | #![deny(clippy::pedantic)]
   |         ^^^^^^^^^^^^^^^^
   = note: `#[deny(clippy::unnested_or_patterns)]` implied by `#[deny(clippy::pedantic)]`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnested_or_patterns
help: nest the patterns
   |
11 |         e @ (E::A | E::B) => {
   |         ^^^^^^^^^^^^^^^^^

The suggested replacement on Rust 1.31.0:

$ cargo +1.31.0 check
                                             
error: expected one of `)`, `,`, or `::`, found `|`                                       
  --> src/main.rs:11:19                                                                   
   |                                                                                      
11 |         e @ (E::A | E::B) => {                                                       
   |                   ^ expected one of `)`, `,`, or `::` here

Meta

• cargo clippy -V: clippy 0.1.52 (5d04957 2021-03-22)
• rustc -Vv:

  rustc 1.53.0-nightly (5d04957a4 2021-03-22)
  binary: rustc
  commit-hash: 5d04957a4b4714f71d38326fc96a0b0ef6dc5800
  commit-date: 2021-03-22
  host: x86_64-unknown-linux-gnu
  release: 1.53.0-nightly
  LLVM version: 12.0.0