Create braces around closure body during printing if needed

dtolnay / syn

Parser for Rust source code

Apache License 2.0

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Create braces around closure body during printing if needed #1658

Closed dtolnay closed 3 months ago

dtolnay commented 3 months ago

If a closure has an omitted return type, any kind of expression is allowed in the closure body: || 1 + 1. But if there is a return type, only a block expression is allowed: || -> i32 { 1 + 1 }. Without braces || -> i32 1 + 1 is not legal syntax.