[Trivia] Completely remove 'backticks' trivia kind

Author: rintaro

Sources/SwiftSyntax/SourceLocation.swift

@@ -406,8 +406,7 @@ fileprivate extension TriviaPiece {
     case let .spaces(count),
          let .tabs(count),
          let .verticalTabs(count),
-         let .formfeeds(count),
-         let .backticks(count):
+         let .formfeeds(count):
       lineLength += SourceLength(utf8Length: count)
     case let .newlines(count),
          let .carriageReturns(count):

Sources/SwiftSyntax/Trivia.swift.gyb

@@ -30,9 +30,6 @@ import Foundation
 public enum TriviaPiece {
 % for trivia in TRIVIAS:
     /// ${trivia.comment}
-%   if trivia.deprecated is not None:
-    @available(*, deprecated, message: "${trivia.deprecated}")
-%   end
 %   if trivia.is_collection():
     case ${trivia.lower_name}s(Int)
 %   else:
@@ -104,9 +101,6 @@ public struct Trivia {
   }
 
 % for trivia in TRIVIAS:
-%   if trivia.deprecated is not None:
-    @available(*, deprecated, message: "${trivia.deprecated}")
-%   end
 %   if trivia.is_collection():
 %   joined = ''.join(trivia.swift_characters)
     /// Return a piece of trivia for some number of '${joined}' characters.
@@ -214,9 +208,6 @@ extension TriviaPiece {
 internal enum TriviaPieceKind: CTriviaKind {
 % for trivia in TRIVIAS:
     /// ${trivia.comment}
-%   if trivia.deprecated is not None:
-    @available(*, deprecated, message: "${trivia.deprecated}")
-%   end
 %   if trivia.is_collection():
     case ${trivia.lower_name}s = ${trivia.serialization_code}
 %   else:

Tests/SwiftSyntaxTest/TriviaTests.swift

@@ -42,10 +42,6 @@ public class TriviaTestCase: XCTestCase {
     XCTAssertEqual(TriviaPiece.carriageReturnLineFeeds(3), .carriageReturnLineFeeds(3))
     XCTAssertNotEqual(TriviaPiece.carriageReturnLineFeeds(4), .carriageReturnLineFeeds(2))
 
-    XCTAssertEqual(TriviaPiece.backticks(2), .backticks(2))
-    XCTAssertNotEqual(TriviaPiece.backticks(3), .backticks(4))
-    XCTAssertNotEqual(TriviaPiece.backticks(3), .spaces(3))
-
     XCTAssertEqual(TriviaPiece.lineComment("a"), .lineComment("a"))
     XCTAssertNotEqual(TriviaPiece.lineComment("a"), .lineComment("b"))
     XCTAssertNotEqual(TriviaPiece.lineComment("a"), .blockComment("a"))