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erlang
0406-Add-clarification-on-nil-type.patch
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File 0406-Add-clarification-on-nil-type.patch of Package erlang
From 629ad2e0971efcf58934c76ea1306b0ff0629339 Mon Sep 17 00:00:00 2001 From: Brujo Benavides <elbrujohalcon@gmail.com> Date: Wed, 8 Aug 2018 12:51:59 -0300 Subject: [PATCH] Add clarification on nil type As explained by @psyeugenic on Slack: > empty list `[]` is regarded as a separate type from `list()`, `[]` < `list()` > i.e. nil is `[]` --- system/doc/reference_manual/expressions.xml | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/system/doc/reference_manual/expressions.xml b/system/doc/reference_manual/expressions.xml index 94e40dd077..684a1191d0 100644 --- a/system/doc/reference_manual/expressions.xml +++ b/system/doc/reference_manual/expressions.xml @@ -567,6 +567,10 @@ Expr1 <input>op</input> Expr2</pre> order is defined:</p> <pre> number < atom < reference < fun < port < pid < tuple < map < nil < list < bit string</pre> + <p><c>nil</c> in the previous expression represents the empty list + (i.e. <c>[]</c>), which is regarded as a separate type from + <c>list/0</c>. That's why <c>nil < list</c>. + </p> <p>Lists are compared element by element. Tuples are ordered by size, two tuples with the same size are compared element by element.</p> -- 2.16.4
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