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[INFO] [stderr] More information about the resolver changes may be found at https://doc.rust-lang.org/nightly/edition-guide/rust-2021/default-cargo-resolver.html
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[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[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[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: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: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: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 12 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0412.
[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 13 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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[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+$"#).unwrap();
[INFO] [stdout] 17  | |     let time_start = period_node.attribute("start")?;
[INFO] [stdout] 18  | |     let time_end = period_node.attribute("end")?;
[INFO] [stdout]     | |                                                ^ use `.ok_or(...)?` to provide an error compatible with `Result<models::Period, CourseDBError>`
[INFO] [stdout] ...   |
[INFO] [stdout] 60  | |     Ok(period)
[INFO] [stdout] 61  | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `Result<models::Period, CourseDBError>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/xml_parser.rs:30:57
[INFO] [stdout]     |
[INFO] [stdout] 15  | / fn parse_period(period_node: Node, strict: bool) -> Result<models::Period, CourseDBError> {
[INFO] [stdout] 16  | |     let time_regex = regex::Regex::new(r#"^\d+$"#).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: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: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 12 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0412.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stderr] error: failed to migrate to next edition
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo fix --edition --allow-no-vcs --allow-dirty --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "8a1a33519d4fe01c74cd18267f7da3cb411b817675b8854ef5f468a84cdeacf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a1a33519d4fe01c74cd18267f7da3cb411b817675b8854ef5f468a84cdeacf6", kill_on_drop: false }`
[INFO] [stdout] 8a1a33519d4fe01c74cd18267f7da3cb411b817675b8854ef5f468a84cdeacf6