Struct SavedOptions 

pub struct SavedOptions {
    pub parser: Option<String>,
    pub lexer: Option<String>,
    pub ambiguity: Option<String>,
    pub priority: Option<Option<String>>,
    pub keep_all_tokens: Option<bool>,
    pub maybe_placeholders: Option<bool>,
    pub ordered_sets: Option<bool>,
}

The compile-invariant half of a save’s data.options block — the options the loader/compiler BAKED into the serialized rules and table, so a faithful load must restore them from the file rather than re-accept them from the caller (Lark’s _LOAD_ALLOWED_OPTIONS complement, lark.py:248 / :570-575).

Every field is Option: the block is absent from grammars written before it was recorded (and from hand-authored loader fixtures), and an absent key means “no opinion — keep the caller’s value”. Read by read_saved_options; applied by Lark::from_json_str.

The runtime half (propagate_positions, g_regex_flags, use_bytes, postlex, transformer, lexer_callbacks) is deliberately NOT here: those are re-supplied at load by design.

Fields

parser: Option<String>

"lalr" | "earley".

lexer: Option<String>

"basic" | "contextual" | "dynamic" | "dynamic_complete" | "custom".

ambiguity: Option<String>

"auto" | "resolve" | "explicit".

priority: Option<Option<String>>

Tri-state: outer None = key absent, inner None = JSON null (Lark’s priority=None, the strip mode), else "auto" | "normal" | "invert".

keep_all_tokens: Option<bool>

maybe_placeholders: Option<bool>

The one that changes TREE SHAPE if lost: [...] optionals insert a placeholder hole under true and nothing under false.

ordered_sets: Option<bool>

Trait Implementations

impl Clone for SavedOptions

fn clone(&self) -> SavedOptions

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SavedOptions

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

Formats the value using the given formatter.

impl Default for SavedOptions

fn default() -> SavedOptions

Returns the “default value” for a type.

impl Eq for SavedOptions

impl PartialEq for SavedOptions

fn eq(&self, other: &SavedOptions) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SavedOptions