add test case

tests/stdlib/t8925.nim

@@ -0,0 +1,16 @@
+discard """
+  file: "strscans.nim"
+  errormsg: "type mismatch between pattern '$i' (position: 1) and HourRange var 'hour'"
+"""
+
+import strscans
+
+type
+  HourRange = range[0..23]
+
+var
+  hour: HourRange
+  timeStr: string
+
+if scanf(timeStr, "$i", hour):
+  discard