Add deprecation for @param foo "abc".

releasenotes.md

@@ -22,6 +22,7 @@
 - Add `d` as floating point suffix for `double` types.
 - Deprecate `f32`, `f64` and `f128` suffixes.
 - Allow recursive generic modules.
+- Add deprecation for `@param foo "abc"`.
 
 ### Fixes
 - Assert triggered when casting from `int[2]` to `uint[2]` #2115

src/compiler/parse_global.c

@@ -2851,6 +2851,11 @@ static inline bool parse_contract_param(ParseContext *c, AstId *docs, AstId **do
 				return false;
 			}
 		}
+		else
+		{
+			RANGE_EXTEND_PREV(ast);
+			SEMA_DEPRECATED(ast, "Not using ':' before the string is deprecated.");
+		}
 	}
 	append_docs(docs_next, docs, ast);
 	return true;