a (#16420)

Co-authored-by: DreamySkrell <>

code/_helpers/lists.dm

@@ -831,3 +831,12 @@
 	. = list()
 	for (var/string in L)
 		. += capitalize(string)
+
+// Transforms a list of lists (of lists) into a single flat list.
+/proc/flatten_list(var/list/L)
+	. = list()
+	for(var/M in L)
+		if(!islist(M))
+			. += M
+		else
+			. += flatten_list(M)

code/datums/ruins.dm

@@ -25,5 +25,5 @@
 		mappaths = list()
 		for (var/suffix in suffixes)
 			mappaths += (prefix + suffix)
-
+	sectors = flatten_list(sectors)
 	..()

html/changelogs/DreamySkrell-flatten-list-sectors.yml

@@ -0,0 +1,41 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.
+author: DreamySkrell
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - bugfix: "Nested lists in ruin definition 'sectors' variable can now be used."