public static List<Expression> getArgumentList(Expression invocation) {
    return asArgumentList(getArguments(invocation));
  }
Tells if the source position for the given AST node is plausible.
Does not imply that the source position is correct.

@param node an AST node
@return <tt>true</tt> iff the AST node has a plausible source position
spock-core/src/main/java/org/spockframework/compiler/AstUtil.java