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</syntaxhighlight>
</syntaxhighlight>
三个 guard 都可使用 <code>z</code>。用 <code>let</code> 无法达到以上的效果。<ref>https://stackoverflow.com/q/4362328/10974106</ref><ref>[https://www.cse.iitb.ac.in/~as/fpcourse/haskell98_tutorial/patterns.html A Gentle Introduction to Haskell] 4.5 Lexical Scoping and Nested Forms</ref>
三个 guard 都可使用 <code>z</code>。用 <code>let</code> 无法达到以上的效果。<ref>https://stackoverflow.com/q/4362328/10974106</ref><ref>[https://www.cse.iitb.ac.in/~as/fpcourse/haskell98_tutorial/patterns.html A Gentle Introduction to Haskell] 4.5 Lexical Scoping and Nested Forms</ref>
== Hlint ==
=== Ignore warnings ===
在 <code>.hlint.yaml</code> 中写:
<syntaxhighlight lang=yaml>
- ignore: {name: Eta reduce}
</syntaxhighlight>
<ref>https://neilmitchell.blogspot.com/2019/01/ignoring-hlint.html</ref>
== 另见 ==
== 另见 ==