All the time. A block (in the general sense so that includes function) which ends with an expression will have that expression’s value as its own value (/ return). A `;` converts the trailing expression into a statement, which does not have a value, and thus the block returns `()` (the something representing nothing).
Method chaining is also common in Rust, because builders are common, and chains of iterator adapters are common, and chains on monadic structures (option/result) are common, … having every line break implicitly insert a `;` would be horrid.
Method chaining is also common in Rust, because builders are common, and chains of iterator adapters are common, and chains on monadic structures (option/result) are common, … having every line break implicitly insert a `;` would be horrid.