* `expression_or_pattern => expression` * Or `expression_or_pattern => pattern => constant_pattern => expression`. There should only be one way to write a pattern; it should not be circular in definition. I'm not sure how Antlr would allow this.
expression_or_pattern => expressionexpression_or_pattern => pattern => constant_pattern => expression.There should only be one way to write a pattern; it should not be circular in definition. I'm not sure how Antlr would allow this.