fixes #8043

tests/errmsgs/tunknown_named_parameter.nim

@@ -0,0 +1,24 @@
+discard """
+cmd: "nim check $file"
+errormsg: "type mismatch: got <string, set[char], maxsplits: int literal(1)>"
+nimout: '''
+proc rsplit(s: string; sep: string; maxsplit: int = -1): seq[string]
+  first type mismatch at position: 2
+  required type: string
+  but expression '{':'}' is of type: set[char]
+proc rsplit(s: string; sep: char; maxsplit: int = -1): seq[string]
+  first type mismatch at position: 2
+  required type: char
+  but expression '{':'}' is of type: set[char]
+proc rsplit(s: string; seps: set[char] = Whitespace; maxsplit: int = -1): seq[string]
+  first type mismatch at position: 3
+  unknown named parameter: maxsplits
+
+expression: rsplit("abc:def", {':'}, maxsplits = 1)
+'''
+"""
+
+# bug #8043
+
+import strutils
+"abc:def".rsplit({':'}, maxsplits = 1)