Enum ValidationError 

pub enum ValidationError {
    Parse(String),
    MissingStudentCodePlaceholder,
    InvalidBulletFormat {
        field: String,
    },
    InvalidPackageName {
        name: String,
    },
}

Why a YAML document is not a valid lesson.

Variants

Parse(String)

The document is not structurally a lesson: a required field is missing, a value has the wrong type, or the YAML is malformed. Carries the underlying parser message, which names the offending field.

MissingStudentCodePlaceholder

exercise.llm_evaluation_prompt is present but lacks the literal {student_code} placeholder, so a learner’s submission could never be inserted into it.

InvalidBulletFormat

A field that must be bullet-formatted (each non-empty line starting with - or * ) contains a non-empty line without a bullet prefix. Parameterized by field name so AC-3 can reuse the variant for hints without adding a new one. Rejected at the parse boundary (§1.3.1) so malformed content never travels downstream.

Fields

field: String

The name of the field with malformed bullets (e.g. "gotchas").

InvalidPackageName

A packages entry is empty or contains a double quote, a comma, or whitespace. Every consumer joins or splits the list on commas (the Quarto packages="a,b" attribute, uv run --with), so such a name would silently become a different package list or break the attribute.

Fields

name: String

The offending entry, verbatim.

Trait Implementations

impl Debug for ValidationError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ValidationError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for ValidationError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.