Merge pull request swiftlang#27044 from drodriguez/remove-warning-TestJSONEncoder

Remove warnings from TestJSONEncoder compilation.

Author: drodriguez

test/stdlib/TestJSONEncoder.swift

@@ -669,7 +669,7 @@ class TestJSONEncoder : TestJSONEncoderSuper {
     encoder.keyEncodingStrategy = .convertToSnakeCase
     do {
       _ = try encoder.encode(toEncode)
-    } catch EncodingError.invalidValue(let (_, context)) {
+    } catch EncodingError.invalidValue(_, let context) {
       expectEqual(2, context.codingPath.count)
       expectEqual("key", context.codingPath[0].stringValue)
       expectEqual("someValue", context.codingPath[1].stringValue)
@@ -685,7 +685,7 @@ class TestJSONEncoder : TestJSONEncoderSuper {
     encoder.keyEncodingStrategy = .convertToSnakeCase
     do {
       _ = try encoder.encode(toEncode)
-    } catch EncodingError.invalidValue(let (_, context)) {
+    } catch EncodingError.invalidValue(_, let context) {
       expectEqual(4, context.codingPath.count)
       expectEqual("key", context.codingPath[0].stringValue)
       expectEqual("sub_key", context.codingPath[1].stringValue)
@@ -838,7 +838,7 @@ class TestJSONEncoder : TestJSONEncoderSuper {
     decoder.keyDecodingStrategy = .convertFromSnakeCase
     do {
       _ = try decoder.decode([String: Int].self, from: input)
-    } catch DecodingError.typeMismatch(let (_, context)) {
+    } catch DecodingError.typeMismatch(_, let context) {
       expectEqual(1, context.codingPath.count)
       expectEqual("leave_me_alone", context.codingPath[0].stringValue)
     } catch {
@@ -860,7 +860,7 @@ class TestJSONEncoder : TestJSONEncoderSuper {
     decoder.keyDecodingStrategy = .convertFromSnakeCase
     do {
       _ = try decoder.decode([String: [String : DecodeFailureNested]].self, from: input)
-    } catch DecodingError.typeMismatch(let (_, context)) {
+    } catch DecodingError.typeMismatch(_, let context) {
       expectEqual(4, context.codingPath.count)
       expectEqual("top_level", context.codingPath[0].stringValue)
       expectEqual("sub_level", context.codingPath[1].stringValue)