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Fix parenthesization of chained comparisons by pretty-printer #134600

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Merged
merged 2 commits into from
Dec 21, 2024
Merged

Fix parenthesization of chained comparisons by pretty-printer #134600

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d748d1d
Add some parenthesization test cases with operators that are not left…
dtolnay Dec 21, 2024
fe65e88
Change comparison operators to have Fixity::None
dtolnay Dec 21, 2024
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Add some parenthesization test cases with operators that are not left… 
…-associative
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@dtolnay
dtolnay committed Dec 21, 2024
commit d748d1d9533bac2a29371b8154acebebaf588ca1
8 changes: 8 additions & 0 deletions tests/ui-fulldeps/pprust-parenthesis-insertion.rs
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Expand Up @@ -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.
Expand Down Expand Up @@ -89,6 +92,11 @@ 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: the value in let-else is not allowed to end in a
// curly brace.
"{ let _ = 1 + 1 else {}; }",
Expand Down