strconv: include package and function name in error strings
Fixes #2548.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5484062
diff --git a/src/pkg/strconv/atoi_test.go b/src/pkg/strconv/atoi_test.go
index 2d06efe..d0e7b61 100644
--- a/src/pkg/strconv/atoi_test.go
+++ b/src/pkg/strconv/atoi_test.go
@@ -152,37 +152,37 @@
 	for i := range atoui64tests {
 		test := &atoui64tests[i]
 		if test.err != nil {
-			test.err = &NumError{test.in, test.err}
+			test.err = &NumError{"ParseUint", test.in, test.err}
 		}
 	}
 	for i := range btoui64tests {
 		test := &btoui64tests[i]
 		if test.err != nil {
-			test.err = &NumError{test.in, test.err}
+			test.err = &NumError{"ParseUint", test.in, test.err}
 		}
 	}
 	for i := range atoi64tests {
 		test := &atoi64tests[i]
 		if test.err != nil {
-			test.err = &NumError{test.in, test.err}
+			test.err = &NumError{"ParseInt", test.in, test.err}
 		}
 	}
 	for i := range btoi64tests {
 		test := &btoi64tests[i]
 		if test.err != nil {
-			test.err = &NumError{test.in, test.err}
+			test.err = &NumError{"ParseInt", test.in, test.err}
 		}
 	}
 	for i := range atoui32tests {
 		test := &atoui32tests[i]
 		if test.err != nil {
-			test.err = &NumError{test.in, test.err}
+			test.err = &NumError{"ParseUint", test.in, test.err}
 		}
 	}
 	for i := range atoi32tests {
 		test := &atoi32tests[i]
 		if test.err != nil {
-			test.err = &NumError{test.in, test.err}
+			test.err = &NumError{"ParseInt", test.in, test.err}
 		}
 	}
 }