Function canrun::collections::lvec::subset

pub fn subset<T, SV, CV>(subset: SV, collection: CV) -> Subset<T>where
    T: Unify,
    SV: Into<Value<LVec<T>>>,
    LVec<T>: Unify,
    CV: Into<Value<LVec<T>>>,

Assert that LVec a is a subset of LVec b.

This means that all of the items in a unify with a contiguous run of items in b.

This goal will fork the state for each match found.

Examples:

use canrun::{LVar, all, unify, lvec, Query};

let needle = LVar::new();
let haystack = LVar::new();
let goal = all![
    unify(&needle, lvec![1]),
    unify(&haystack, lvec![1, 2, 3]),
    lvec::subset(&needle, haystack),
];
let results: Vec<_> = goal.query(needle).collect();
assert_eq!(results, vec![vec![1]]);