Merge match arms fails to take type of pattern variable into account

[ChaiTRex]

In VS Code, Merge match arms offers to merge the two lines in the Display implementation, even though the type of the x in each is different. This will produce a type error when compiled.

use std::fmt::{Display, Formatter, Result};

#[derive(Debug, Eq, Ord, PartialEq, PartialOrd)]
pub enum Value {
    Char(char),
    I8(i8),
}

impl Display for Value {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        match self {
            Value::Char(x) => x.fmt(f),
            Value::I8(x) => x.fmt(f),
        }
    }
}

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rust-analyzer version: f0618a8 2021-06-14 stable
rust-analyzer VS Code extension version: v0.2.637
VS Code version: 1.57.0