reference grammar: remove duplicate else_tail rule
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@ -688,7 +688,6 @@ match_pat : pat [ '|' pat ] * [ "if" expr ] ? ;
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```antlr
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```antlr
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if_let_expr : "if" "let" pat '=' expr '{' block '}'
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if_let_expr : "if" "let" pat '=' expr '{' block '}'
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else_tail ? ;
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else_tail ? ;
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else_tail : "else" [ if_expr | if_let_expr | '{' block '}' ] ;
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```
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```
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### While let loops
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### While let loops
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