func parse_expr_source(source: String) -> ParseOutcomeScans and parses the complete input as exactly one expression.
The root is wrapped as Item.expr_item; trailing tokens are not silently ignored.
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pub func parse_expr_source(source: String) -> ParseOutcome {
let result = scan(source: source)
let comments = result.comments
let parser = scan_parser(source: source, result: result)
parser.parse_expr_root()
parser.finish(comments: comments)
}