Function matchPattern

matchPattern(
    source: readonly Thing<string | ThingType>[],
    pattern: Thing<pattern>,
    findAll?: boolean,
): MatchResult[]
Finds all of the matches of the pattern and returns (for each match) the bindings and the span.

Uses a tree-walking version of Thompson's NFA construction internally, for speed.
Parameters
- source: readonly Thing<string | ThingType>[]
  Stream of tokens to be fed to the pattern matching.
- pattern: Thing<pattern>
  A single parsed pattern tree to match against the source.
- findAll: boolean = true
  Whether to find all matches, if true, or stop early when the leftmost match is found, if false. (Default true)
Returns MatchResult[]