Rollup merge of #134600 - dtolnay:chainedcomparison, r=oli-obk

Fix parenthesization of chained comparisons by pretty-printer

Example:

```rust
macro_rules! repro {
    () => {
        1 < 2
    };
}

fn main() {
    let _ = repro!() == false;
}
```

Previously `-Zunpretty=expanded` would pretty-print this syntactically invalid output: `fn main() { let _ = 1 < 2 == false; }`

```console
error: comparison operators cannot be chained
 --> <anon>:8:23
  |
8 | fn main() { let _ = 1 < 2 == false; }
  |                       ^   ^^
  |
help: parenthesize the comparison
  |
8 | fn main() { let _ = (1 < 2) == false; }
  |                     +     +
```

With the fix, it will print `fn main() { let _ = (1 < 2) == false; }`.

Making `-Zunpretty=expanded` consistently produce syntactically valid Rust output is important because that is what makes it possible for `cargo expand` to format and perform filtering on the expanded code.

## Review notes

According to `rg '\.fixity\(\)' compiler/` the `fixity` function is called only 3 places:

- https://github.com/rust-lang/rust/blob/13170cd787cb733ed24842ee825bcbd98dc01476/compiler/rustc_ast_pretty/src/pprust/state/expr.rs#L283-L287

- https://github.com/rust-lang/rust/blob/13170cd787cb733ed24842ee825bcbd98dc01476/compiler/rustc_hir_pretty/src/lib.rs#L1295-L1299

- https://github.com/rust-lang/rust/blob/13170cd787cb733ed24842ee825bcbd98dc01476/compiler/rustc_parse/src/parser/expr.rs#L282-L289

The 2 pretty printers definitely want to treat comparisons using `Fixity::None`. That's the whole bug being fixed. Meanwhile, the parser's `Fixity::None` codepath is previously unreachable as indicated by the comment, so as long as `Fixity::None` here behaves exactly the way that `Fixity::Left` used to behave, you can tell that this PR definitely does not constitute any behavior change for the parser.

My guess for why comparison operators were set to `Fixity::Left` instead of `Fixity::None` is that it's a very old workaround for giving a good chained comparisons diagnostic (like what I pasted above). Nowadays that is handled by a different dedicated codepath.

1 files changed, 10 insertions, 4 deletions

diff --git a/tests/ui-fulldeps/pprust-parenthesis-insertion.rs b/tests/ui-fulldeps/pprust-parenthesis-insertion.rs
index 184458bad55..258a1fdb1d3 100644
--- a/tests/ui-fulldeps/pprust-parenthesis-insertion.rs
+++ b/tests/ui-fulldeps/pprust-parenthesis-insertion.rs
@@ -61,6 +61,9 @@ static EXPRS: &[&str] = &[
     "(2 + 2) * 2",
     "2 * (2 + 2)",
     "2 + 2 + 2",
+    // Right-associative operator.
+    "2 += 2 += 2",
+    "(2 += 2) += 2",
     // Return has lower precedence than a binary operator.
     "(return 2) + 2",
     "2 + (return 2)", // FIXME: no parenthesis needed.
@@ -89,6 +92,13 @@ static EXPRS: &[&str] = &[
     // allowed, except if the break is also labeled.
     "break 'outer 'inner: loop {} + 2",
     "break ('inner: loop {} + 2)",
+    // Grammar restriction: ranges cannot be the endpoint of another range.
+    "(2..2)..2",
+    "2..(2..2)",
+    "(2..2)..",
+    "..(2..2)",
+    // Grammar restriction: comparison operators cannot be chained (1 < 2 == false).
+    "((1 < 2) == false) as usize",
     // Grammar restriction: the value in let-else is not allowed to end in a
     // curly brace.
     "{ let _ = 1 + 1 else {}; }",
@@ -113,10 +123,6 @@ static EXPRS: &[&str] = &[
     "if let _ = () && (Struct {}).x {}",
     */
     /*
-    // FIXME: pretty-printer produces invalid syntax. `(1 < 2 == false) as usize`
-    "((1 < 2) == false) as usize",
-    */
-    /*
     // FIXME: pretty-printer produces invalid syntax. `for _ in 1..{ 2 } {}`
     "for _ in (1..{ 2 }) {}",
     */