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[INFO] [stdout] a986dcd2048cb913b0e1e45c968888650d88931c
[INFO] checking CerulanLumina/whereisclass against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulanLumina%2Fwhereisclass" "/workspace/builds/worker-7/source", kill_on_drop: false }`
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[INFO] validating manifest of git repo https://github.com/CerulanLumina/whereisclass on toolchain 1.55.0
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[INFO] finished tweaking git repo https://github.com/CerulanLumina/whereisclass
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[INFO] crate git repo https://github.com/CerulanLumina/whereisclass already has a lockfile, it will not be regenerated
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[INFO] [stdout] error[E0412]: cannot find type `NoneError` in module `std::option`
[INFO] [stdout]    --> src/xml_parser.rs:209:24
[INFO] [stdout]     |
[INFO] [stdout] 209 | impl From<std::option::NoneError> for CourseDBError {
[INFO] [stdout]     |                        ^^^^^^^^^ not found in `std::option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `NoneError` in module `std::option`
[INFO] [stdout]    --> src/xml_parser.rs:210:29
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn from(_: std::option::NoneError) -> Self {
[INFO] [stdout]     |                             ^^^^^^^^^ not found in `std::option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `NoneError` in module `std::option`
[INFO] [stdout]    --> src/xml_parser.rs:209:24
[INFO] [stdout]     |
[INFO] [stdout] 209 | impl From<std::option::NoneError> for CourseDBError {
[INFO] [stdout]     |                        ^^^^^^^^^ not found in `std::option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `NoneError` in module `std::option`
[INFO] [stdout]    --> src/xml_parser.rs:210:29
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn from(_: std::option::NoneError) -> Self {
[INFO] [stdout]     |                             ^^^^^^^^^ not found in `std::option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:11:25
[INFO] [stdout]     |
[INFO] [stdout] 10  | / fn parse_day(day: Node) -> Result<models::Day, CourseDBError> {
[INFO] [stdout] 11  | |     let day = day.text()?.into();
[INFO] [stdout]     | |                         ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Day, CourseDBError>`
[INFO] [stdout] 12  | |     Ok(day)
[INFO] [stdout] 13  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Day, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:17:52
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout]     | |                                                    ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:11:25
[INFO] [stdout]     |
[INFO] [stdout] 10  | / fn parse_day(day: Node) -> Result<models::Day, CourseDBError> {
[INFO] [stdout] 11  | |     let day = day.text()?.into();
[INFO] [stdout]     | |                         ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Day, CourseDBError>`
[INFO] [stdout] 12  | |     Ok(day)
[INFO] [stdout] 13  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Day, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:17:52
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout]     | |                                                    ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:18:48
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout]     | |                                                ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:18:48
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout]     | |                                                ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:30:57
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 30  | |     let instructor = period_node.attribute("instructor")?.to_string();
[INFO] [stdout]     | |                                                         ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:30:57
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 30  | |     let instructor = period_node.attribute("instructor")?.to_string();
[INFO] [stdout]     | |                                                         ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:64:27
[INFO] [stdout]     |
[INFO] [stdout] 63  | / fn parse_note(note: Node) -> Result<String, CourseDBError> {
[INFO] [stdout] 64  | |     let note = note.text()?.to_string();
[INFO] [stdout]     | |                           ^ use `.ok_or(...)?` to provide an error compatible with `Result<std::string::String, CourseDBError>`
[INFO] [stdout] 65  | |     Ok(note)
[INFO] [stdout] 66  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<std::string::String, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:69:44
[INFO] [stdout]     |
[INFO] [stdout] 68  | / fn parse_section(section_node: Node, strict: bool) -> Result<models::Section, CourseDBError> {
[INFO] [stdout] 69  | |     let crn = section_node.attribute("crn")?;
[INFO] [stdout]     | |                                            ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Section, CourseDBError>`
[INFO] [stdout] 70  | |     let crn = u32::from_str(crn)?;
[INFO] [stdout] 71  | |     let num = section_node.attribute("num")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 120 | |     Ok(section)
[INFO] [stdout] 121 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Section, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:71:44
[INFO] [stdout]     |
[INFO] [stdout] 68  | / fn parse_section(section_node: Node, strict: bool) -> Result<models::Section, CourseDBError> {
[INFO] [stdout] 69  | |     let crn = section_node.attribute("crn")?;
[INFO] [stdout] 70  | |     let crn = u32::from_str(crn)?;
[INFO] [stdout] 71  | |     let num = section_node.attribute("num")?;
[INFO] [stdout]     | |                                            ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Section, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 120 | |     Ok(section)
[INFO] [stdout] 121 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Section, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:64:27
[INFO] [stdout]     |
[INFO] [stdout] 63  | / fn parse_note(note: Node) -> Result<String, CourseDBError> {
[INFO] [stdout] 64  | |     let note = note.text()?.to_string();
[INFO] [stdout]     | |                           ^ use `.ok_or(...)?` to provide an error compatible with `Result<std::string::String, CourseDBError>`
[INFO] [stdout] 65  | |     Ok(note)
[INFO] [stdout] 66  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<std::string::String, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:69:44
[INFO] [stdout]     |
[INFO] [stdout] 68  | / fn parse_section(section_node: Node, strict: bool) -> Result<models::Section, CourseDBError> {
[INFO] [stdout] 69  | |     let crn = section_node.attribute("crn")?;
[INFO] [stdout]     | |                                            ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Section, CourseDBError>`
[INFO] [stdout] 70  | |     let crn = u32::from_str(crn)?;
[INFO] [stdout] 71  | |     let num = section_node.attribute("num")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 120 | |     Ok(section)
[INFO] [stdout] 121 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Section, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:71:44
[INFO] [stdout]     |
[INFO] [stdout] 68  | / fn parse_section(section_node: Node, strict: bool) -> Result<models::Section, CourseDBError> {
[INFO] [stdout] 69  | |     let crn = section_node.attribute("crn")?;
[INFO] [stdout] 70  | |     let crn = u32::from_str(crn)?;
[INFO] [stdout] 71  | |     let num = section_node.attribute("num")?;
[INFO] [stdout]     | |                                            ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Section, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 120 | |     Ok(section)
[INFO] [stdout] 121 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Section, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:125:45
[INFO] [stdout]     |
[INFO] [stdout] 124 | / fn parse_course(course_node: Node, strict: bool) -> Result<models::Course, CourseDBError> {
[INFO] [stdout] 125 | |     let name = course_node.attribute("name")?.to_string();
[INFO] [stdout]     | |                                             ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Course, CourseDBError>`
[INFO] [stdout] 126 | |     let dept = course_node.attribute("dept")?.to_string();
[INFO] [stdout] 127 | |     let num = course_node.attribute("num")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 159 | |     Ok(course)
[INFO] [stdout] 160 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Course, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:126:45
[INFO] [stdout]     |
[INFO] [stdout] 124 | / fn parse_course(course_node: Node, strict: bool) -> Result<models::Course, CourseDBError> {
[INFO] [stdout] 125 | |     let name = course_node.attribute("name")?.to_string();
[INFO] [stdout] 126 | |     let dept = course_node.attribute("dept")?.to_string();
[INFO] [stdout]     | |                                             ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Course, CourseDBError>`
[INFO] [stdout] 127 | |     let num = course_node.attribute("num")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 159 | |     Ok(course)
[INFO] [stdout] 160 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Course, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:125:45
[INFO] [stdout]     |
[INFO] [stdout] 124 | / fn parse_course(course_node: Node, strict: bool) -> Result<models::Course, CourseDBError> {
[INFO] [stdout] 125 | |     let name = course_node.attribute("name")?.to_string();
[INFO] [stdout]     | |                                             ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Course, CourseDBError>`
[INFO] [stdout] 126 | |     let dept = course_node.attribute("dept")?.to_string();
[INFO] [stdout] 127 | |     let num = course_node.attribute("num")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 159 | |     Ok(course)
[INFO] [stdout] 160 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Course, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:127:43
[INFO] [stdout]     |
[INFO] [stdout] 124 | / fn parse_course(course_node: Node, strict: bool) -> Result<models::Course, CourseDBError> {
[INFO] [stdout] 125 | |     let name = course_node.attribute("name")?.to_string();
[INFO] [stdout] 126 | |     let dept = course_node.attribute("dept")?.to_string();
[INFO] [stdout] 127 | |     let num = course_node.attribute("num")?;
[INFO] [stdout]     | |                                           ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Course, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 159 | |     Ok(course)
[INFO] [stdout] 160 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Course, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:126:45
[INFO] [stdout]     |
[INFO] [stdout] 124 | / fn parse_course(course_node: Node, strict: bool) -> Result<models::Course, CourseDBError> {
[INFO] [stdout] 125 | |     let name = course_node.attribute("name")?.to_string();
[INFO] [stdout] 126 | |     let dept = course_node.attribute("dept")?.to_string();
[INFO] [stdout]     | |                                             ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Course, CourseDBError>`
[INFO] [stdout] 127 | |     let num = course_node.attribute("num")?;
[INFO] [stdout] ...   |
[INFO] [stdout] 159 | |     Ok(course)
[INFO] [stdout] 160 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Course, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:127:43
[INFO] [stdout]     |
[INFO] [stdout] 124 | / fn parse_course(course_node: Node, strict: bool) -> Result<models::Course, CourseDBError> {
[INFO] [stdout] 125 | |     let name = course_node.attribute("name")?.to_string();
[INFO] [stdout] 126 | |     let dept = course_node.attribute("dept")?.to_string();
[INFO] [stdout] 127 | |     let num = course_node.attribute("num")?;
[INFO] [stdout]     | |                                           ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Course, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 159 | |     Ok(course)
[INFO] [stdout] 160 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Course, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 13 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0412, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 13 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0412, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `whereisclass` due to 14 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "01f05e7511bed688a19978f3c2db4b42e17969db40b2bafc5733d7020e5d2035", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01f05e7511bed688a19978f3c2db4b42e17969db40b2bafc5733d7020e5d2035", kill_on_drop: false }`
[INFO] [stdout] 01f05e7511bed688a19978f3c2db4b42e17969db40b2bafc5733d7020e5d2035
