Fix LoggerTest

Summary: Fix overspecified LoggerTest.

Reviewed By: yfeldblum, simpkins

Differential Revision: D23425421

fbshipit-source-id: ecfd7d0e73555b3a94a81b54ffd1287bf9664697

folly/logging/test/LoggerTest.cpp

@@ -206,8 +206,7 @@ TEST_F(LoggerTest, formatFallbackError) {
   ASSERT_EQ(1, messages.size());
   EXPECT_THAT(
       messages[0].first.getMessage(),
-      MatchesRegex(
-          R"(error formatting log message: .*argument index out of range; )"
+      MatchesRegex(R"(error formatting log message: .*format_error.*; )"
                    R"(format string: "param1: \{\}, param2: \{\}, \{\}", )"
                    R"(arguments: 1234, )"
                    R"(\[(.*ToStringFailure.*|object) of size (.*):.*\])"));
@@ -345,8 +344,7 @@ TEST_F(LoggerTest, logMacros) {
   ASSERT_EQ(1, messages.size());
   EXPECT_THAT(
       messages[0].first.getMessage(),
-      MatchesRegex(
-          R"(error formatting log message: .*argument index out of range; )"
+      MatchesRegex(R"(error formatting log message: .*format_error.*; )"
                    R"(format string: "whoops: \{\}, \{\}", arguments: 5)"));
   messages.clear();
 }