`normalize_comments = true` de-normalizes some comments

[drahnr]

According to https://rust-lang.github.io/rustfmt/?version=v1.4.36&search=#normalize_comments should convert /* yada */ to // yada, but the inverse happens.

# rustfmt +nightly --version
rustfmt 1.4.37-nightly (d2b04f0 2021-07-07)

normalize_comments = true
normalize_doc_attributes = true

results in a delta of

@@ -150,11 +151,11 @@ pub enum Stage {
        AvailabilityRecovery = 6,
        BitfieldDistribution = 7,
        ApprovalChecking = 8,
-       // Expand as needed, numbers should be ascending according to the stage
-       // through the inclusion pipeline, or according to the descriptions
-       // in [the path of a para chain block]
-       // (https://polkadot.network/the-path-of-a-parachain-block/)
-       // see [issue](https://github.com/paritytech/polkadot/issues/2389)
+       /* Expand as needed, numbers should be ascending according to the stage
+        * through the inclusion pipeline, or according to the descriptions
+        * in [the path of a para chain block]
+        * (https://polkadot.network/the-path-of-a-parachain-block/)
+        * see [issue](https://github.com/paritytech/polkadot/issues/2389) */
 }
 
 /// A wrapper type for a span.

[calebcartwright]

Thanks for the report. This is technically a duplicate of a similar report added in a comment in #3350, but better to have a dedicated issue for it any way

[jplatte]

I just hit this when commenting out a field in a struct definition, but I haven't even set normalize_comments = true.

rustfmt --version: 1.4.37-nightly (5ecc8ad 2021-09-19)

.rustfmt.toml:

comment_width = 100
imports_granularity = "Crate"
newline_style = "Unix"
use_small_heuristics = "Max"
wrap_comments = true

[awused]

I'm also seeing this, regardless of the setting it converts a series of line comments to one block comment, with no ability to disable it. It's very annoying since I commonly comment and uncomment lines (say, benchmarks or parts of tests as I'm working on things) using a vim extension but it doesn't properly work with block comments. Rust is the only language where the formatter gets in the way like this.