error: expected one of `,`, `:`, or `>`, found `=` --> $DIR/issue-34334.rs:2:29 | LL | let sr: Vec<(u32, _, _) = vec![]; | -- - ^ expected one of `,`, `:`, or `>` | | | | | maybe try to close unmatched angle bracket | while parsing the type for `sr` | help: you might have meant to end the type parameters here | LL | let sr: Vec<(u32, _, _)> = vec![]; | + error[E0277]: a value of type `Vec<(u32, _, _)>` cannot be built from an iterator over elements of type `()` --> $DIR/issue-34334.rs:5:87 | LL | let sr2: Vec<(u32, _, _)> = sr.iter().map(|(faction, th_sender, th_receiver)| {}).collect(); | ^^^^^^^ value of type `Vec<(u32, _, _)>` cannot be built from `std::iter::Iterator` | = help: the trait `FromIterator<()>` is not implemented for `Vec<(u32, _, _)>` = help: the trait `FromIterator` is implemented for `Vec` note: required by a bound in `collect` --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL | LL | fn collect>(self) -> B | ^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `collect` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.