fix #11009 (#14935)

compiler/semdata.nim

@@ -143,6 +143,7 @@ type
       # would otherwise fail.
     unusedImports*: seq[(PSym, TLineInfo)]
     exportIndirections*: HashSet[(int, int)]
+    lastTLineInfo*: TLineInfo
 
 template config*(c: PContext): ConfigRef = c.graph.config
 

compiler/suggest.nim

@@ -557,7 +557,12 @@ proc markUsed(c: PContext; info: TLineInfo; s: PSym) =
     if sfDeprecated in s.owner.flags:
       warnAboutDeprecated(conf, info, s)
   if {sfDeprecated, sfError} * s.flags != {}:
-    if sfDeprecated in s.flags: warnAboutDeprecated(conf, info, s)
+    if sfDeprecated in s.flags:
+      if not (c.lastTLineInfo.line == info.line and 
+              c.lastTLineInfo.col == info.col):
+        warnAboutDeprecated(conf, info, s)
+        c.lastTLineInfo = info
+
     if sfError in s.flags: userError(conf, info, s)
   when defined(nimsuggest):
     suggestSym(conf, info, s, c.graph.usageSym, false)

tests/deprecated/tmessages.nim

@@ -0,0 +1,10 @@
+discard """
+  nimout:'''tmessages.nim(10, 1) Warning: Deprecated since v1.2.0, use 'HelloZ'; hello is deprecated [Deprecated]
+'''
+"""
+
+proc hello[T](a: T) {.deprecated: "Deprecated since v1.2.0, use 'HelloZ'".} =
+  discard
+
+
+hello[int](12)