Index: lib/StaticAnalyzer/Checkers/ConversionChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/ConversionChecker.cpp
+++ lib/StaticAnalyzer/Checkers/ConversionChecker.cpp
@@ -23,6 +23,7 @@
 //
 //===----------------------------------------------------------------------===//
 #include "ClangSACheckers.h"
+#include "InterCheckerAPI.h"
 #include "clang/AST/ParentMap.h"
 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
 #include "clang/StaticAnalyzer/Core/Checker.h"
@@ -159,5 +160,6 @@
 }
 
 void ento::registerConversionChecker(CheckerManager &mgr) {
+  registerStdCLibraryFunctionsChecker(mgr);
   mgr.registerChecker<ConversionChecker>();
 }
Index: lib/StaticAnalyzer/Checkers/InterCheckerAPI.h
===================================================================
--- lib/StaticAnalyzer/Checkers/InterCheckerAPI.h
+++ lib/StaticAnalyzer/Checkers/InterCheckerAPI.h
@@ -23,5 +23,8 @@
 /// Register the part of MallocChecker connected to InnerPointerChecker.
 void registerInnerPointerCheckerAux(CheckerManager &Mgr);
 
+/// Register evaluation of some basic C standard library functions.
+void registerStdCLibraryFunctionsChecker(CheckerManager &mgr);
+
 }}
 #endif /* INTERCHECKERAPI_H_ */
Index: test/Analysis/conversion.c
===================================================================
--- test/Analysis/conversion.c
+++ test/Analysis/conversion.c
@@ -138,15 +138,14 @@
 }
 
 
-// false positives..
+// old false positives..
 
 int isascii(int c);
 void falsePositive1() {
   char kb2[5];
   int X = 1000;
   if (isascii(X)) {
-    // FIXME: should not warn here:
-    kb2[0] = X; // expected-warning {{Loss of precision}}
+    kb2[0] = X; // no-warning
   }
 }
 
@@ -175,8 +174,7 @@
       if (c == EOF)
         return(4);
       if (cp < &reply_string[sizeof(reply_string) - 1])
-        // FIXME: should not warn here:
-        *cp++ = c; // expected-warning {{Loss of precision}}
+        *cp++ = c; // no-warning
     }
   }
 }