Split error code to ease future improvements

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index d3dbd3d3fde2f25c710476f740488e67670e69f2..d6e8567944d1db1a5597fe8e6ed37ac7cf0ecd80 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -7157,9 +7157,18 @@ class ResolverVisitor extends ScopedVisitor {
       }
     } else if (positionalArgumentCount > unnamedParameterCount &&
         noBlankArguments) {
-      ErrorCode errorCode = (reportAsError
-          ? CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS
-          : StaticWarningCode.EXTRA_POSITIONAL_ARGUMENTS);
+      ErrorCode errorCode;
+      int namedParameterCount = namedParameters?.length ?? 0;
+      int namedArgumentCount = usedNames?.length ?? 0;
+      if (namedParameterCount > namedArgumentCount) {
+        errorCode = (reportAsError
+            ? CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS_COULD_BE_NAMED
+            : StaticWarningCode.EXTRA_POSITIONAL_ARGUMENTS_COULD_BE_NAMED);
+      } else {
+        errorCode = (reportAsError
+            ? CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS
+            : StaticWarningCode.EXTRA_POSITIONAL_ARGUMENTS);
+      }
       if (onError != null) {
         onError(errorCode, argumentList,
             [unnamedParameterCount, positionalArgumentCount]);