Function parseExprWithLabel

src/parser/syntaxes/expressions.ts:354–371

* ```abnf * ExprWithLabel = "#" IDENT ":" Expr * ```

(s: ITokenStream)

 * ```
*/
function parseExprWithLabel(s: ITokenStream): Ast.If | Ast.Match | Ast.Block {
	const label = parseLabel(s);
	s.expect(TokenKind.Colon);
	s.next();

	const expr = parseExpr(s, false);
	switch (expr.type) {
		case 'if':
		case 'match':
		case 'block': {
			expr.label = label;
			return expr;
		}
		default: {
			throw new AiScriptSyntaxError('cannot use label for expression other than eval / if / match', expr.loc.start);
		}
	}
}

/**
 * ```abnf