with_style_error.rs

 4:21.31 error[E0524]: two closures require unique access to `addend` at the same time
 4:21.32     --> servo/components/style/custom_properties.rs:1194:42
 4:21.32      |
 4:21.33 1155 | fn substitute_block<'i>(
 4:21.33      |                     -- lifetime `'i` defined here
 4:21.34 ...
 4:21.34 1194 |                 input.parse_nested_block(|input| {
 4:21.35      |                                          ^^^^^^^ closures are constructed here in different iterations of loop
 4:21.35 ...
 4:21.35 1229 |                                     addend,
 4:21.37      |                                     ------ capture is mutable because of use here
 4:21.37 ...
 4:21.37 1233 |                                 let mut addend_input = ParserInput::new(&addend.css);
 4:21.37      |                                                        ----------------------------- assignment requires that `addend` is borrowed for `'i`
 4:21.38 ...
 4:21.38 1263 |                         partial_computed_value.push_variable(&input, &addend)?;
 4:21.38      |                                                                       ------ borrows occur due to use of `addend` in closure
 4:21.39 error[E0621]: explicit lifetime required in the type of `addend`
 4:21.39     --> servo/components/style/custom_properties.rs:1233:56
 4:21.39      |
 4:21.39 1159 |     addend: &mut ComputedValue,
 4:21.40      |             ------------------ help: add explicit lifetime `'i` to the type of `addend`: `&'i mut VariableValue`
 4:21.40 ...
 4:21.40 1233 |                                 let mut addend_input = ParserInput::new(&addend.css);
 4:21.40      |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime `'i` required
 4:21.41 error[E0597]: `addend` does not live long enough
 4:21.41     --> servo/components/style/custom_properties.rs:1263:71
 4:21.41      |
 4:21.41 1155 | fn substitute_block<'i>(
 4:21.42      |                     -- lifetime `'i` defined here
 4:21.42 ...
 4:21.43 1194 |                 input.parse_nested_block(|input| {
 4:21.43      |                                          ------- value captured here
 4:21.43 ...
 4:21.43 1233 |                                 let mut addend_input = ParserInput::new(&addend.css);
 4:21.43      |                                                        ----------------------------- assignment requires that `addend` is borrowed for `'i`
 4:21.44 ...
 4:21.44 1263 |                         partial_computed_value.push_variable(&input, &addend)?;
 4:21.45      |                                                                       ^^^^^^ borrowed value does not live long enough
 4:21.45 ...
 4:21.45 1297 | }
 4:21.46      |  - `addend` dropped here while still borrowed
 4:21.46 error[E0524]: two closures require unique access to `addend` at the same time
 4:21.46     --> servo/components/style/custom_properties.rs:1273:42
 4:21.46      |
 4:21.47 1194 |                 input.parse_nested_block(|input| {
 4:21.47      |                                          ------- first closure is constructed here
 4:21.47 ...
 4:21.47 1229 |                                     addend,
 4:21.47      |                                     ------ capture is mutable because of use here
 4:21.48 ...
 4:21.48 1263 |                         partial_computed_value.push_variable(&input, &addend)?;
 4:21.48      |                                                                       ------ first borrow occurs due to use of `addend` in closure
 4:21.49 ...
 4:21.49 1273 |                 input.parse_nested_block(|input| {
 4:21.49      |                       ------------------ ^^^^^^^ second closure is constructed here
 4:21.49      |                       |
 4:21.50      |                       first borrow later used by call
 4:21.51 ...
 4:21.51 1278 |                         addend,
 4:21.52      |                         ------ second borrow occurs due to use of `addend` in closure