Remove a few throws annotations that weren’t necesary in tests

Sources/_SwiftSyntaxTestSupport/Syntax+Assertions.swift

@@ -80,7 +80,7 @@ public struct SubtreeMatcher {
   /// The syntax tree from parsing source *with markers removed*.
   private var actualTree: Syntax
 
-  public init(_ markedText: String, parse: (String) throws -> Syntax) throws {
+  public init(_ markedText: String, parse: (String) throws -> Syntax) rethrows {
     let (markers, text) = extractMarkers(markedText)
 
     self.markers = markers.isEmpty ? ["DEFAULT": 0] : markers

Tests/PerformanceTest/ParsingPerformanceTests.swift

@@ -22,7 +22,7 @@ public class ParsingPerformanceTests: XCTestCase {
     }
   }
 
-  func testNativeParsingPerformance() throws {
+  func testNativeParsingPerformance() {
     measure {
       do {
         let source = try String(contentsOf: inputFile)

Tests/SwiftDiagnosticsTest/DiagnosticsFormatterTests.swift

@@ -17,13 +17,13 @@ import SwiftParser
 
 final class DiagnosticsFormatterTests: XCTestCase {
 
-  func annotate(source: String) throws -> String {
+  func annotate(source: String) -> String {
     let tree = Parser.parse(source: source)
     let diags = ParseDiagnosticsGenerator.diagnostics(for: tree)
     return DiagnosticsFormatter.annotatedSource(tree: tree, diags: diags)
   }
 
-  func testSingleDiagnostic() throws {
+  func testSingleDiagnostic() {
     let source = """
     var foo = bar +
     """
@@ -32,10 +32,10 @@ final class DiagnosticsFormatterTests: XCTestCase {
       ∣                ╰─ expected expression in variable
 
     """
-    AssertStringsEqualWithDiff(expectedOutput, try annotate(source: source))
+    AssertStringsEqualWithDiff(expectedOutput, annotate(source: source))
   }
 
-  func testMultipleDiagnosticsInOneLine() throws {
+  func testMultipleDiagnosticsInOneLine() {
     let source = """
     foo.[].[].[]
     """
@@ -46,10 +46,10 @@ final class DiagnosticsFormatterTests: XCTestCase {
       ∣     ╰─ expected name in member access
 
     """
-    AssertStringsEqualWithDiff(expectedOutput, try annotate(source: source))
+    AssertStringsEqualWithDiff(expectedOutput, annotate(source: source))
   }
 
-  func testLineSkipping() throws {
+  func testLineSkipping() {
     let source = """
     var i = 1
     i = 2

Tests/SwiftOperatorsTest/OperatorTableTests.swift

@@ -187,7 +187,7 @@ public class OperatorPrecedenceTests: XCTestCase {
     XCTAssertNil(foldedExpr.as(SequenceExprSyntax.self))
   }
 
-  func testParseErrors() throws {
+  func testParseErrors() {
     let sources =
     """
     infix operator +
@@ -231,7 +231,7 @@ public class OperatorPrecedenceTests: XCTestCase {
     _ = existingGroup
   }
 
-  func testUnaryErrors() throws {
+  func testUnaryErrors() {
     let sources =
       """
       prefix operator +

Tests/SwiftParserTest/Attributes.swift

@@ -189,7 +189,7 @@ final class AttributeTests: XCTestCase {
       """)
   }
 
-  func testImplementsAttribute() throws {
+  func testImplementsAttribute() {
     AssertParse("""
       @_implements(P, f0())
       func g0() -> Int {
@@ -213,7 +213,7 @@ final class AttributeTests: XCTestCase {
       """)
   }
 
-  func testSemanticsAttribute() throws {
+  func testSemanticsAttribute() {
     AssertParse(
       """
       @_semantics("constant_evaluable")

Tests/SwiftParserTest/Availability.swift

@@ -3,7 +3,7 @@
 import XCTest
 
 final class AvailabilityTests: XCTestCase {
-  func testAvailableMember() throws {
+  func testAvailableMember() {
     AssertParse(
       """
       @available(OSX 10.0, introduced: 10.12)
@@ -51,7 +51,7 @@ final class AvailabilityTests: XCTestCase {
     )
   }
 
-  func testAvailabilityMacros() throws {
+  func testAvailabilityMacros() {
     AssertParse(
       """
       @available(_iOS9, _macOS10_11, tvOS 11.0, *)
@@ -65,7 +65,7 @@ final class AvailabilityTests: XCTestCase {
       """)
   }
 
-  func testSPIAvailabilityAttribute() throws {
+  func testSPIAvailabilityAttribute() {
     AssertParse(
       """
       @_spi_available(*, deprecated, renamed: "another")

Tests/SwiftParserTest/Declarations.swift

@@ -1083,7 +1083,7 @@ final class DeclarationTests: XCTestCase {
     )
   }
 
-  func testReasyncFunctions() throws {
+  func testReasyncFunctions() {
     AssertParse(
       """
       class MyType {

Tests/SwiftParserTest/DiagnosticInfrastructureTests.swift

@@ -3,7 +3,7 @@ import SwiftDiagnostics
 import SwiftParser
 
 public class DiagnosticInfrastructureTests: XCTestCase {
-  public func testDiagnosticID() throws {
+  public func testDiagnosticID() {
     struct TestDiagnostic: ParserError {
       let message: String = "My test diagnostic"
     }

Tests/SwiftParserTest/LexerTests.swift

@@ -19,7 +19,7 @@ private func lexeme(
 }
 
 public class LexerTests: XCTestCase {
-  func testIdentifiers() throws {
+  func testIdentifiers() {
     var data =
     """
     Hello World
@@ -34,7 +34,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testEscapedIdentifiers() throws {
+  func testEscapedIdentifiers() {
     var data =
     """
     `Hello` `World` `$`
@@ -50,7 +50,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testBlockComments() throws {
+  func testBlockComments() {
     do {
       var data =
       """
@@ -89,7 +89,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testDeepTupleAccess() throws {
+  func testDeepTupleAccess() {
     var data =
     #"""
     x.1.0
@@ -108,7 +108,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testUnicodeLiteral() throws {
+  func testUnicodeLiteral() {
     do {
       var data =
       #"""
@@ -141,7 +141,7 @@ public class LexerTests: XCTestCase {
   }
 
 
-  func testNumberLiterals() throws {
+  func testNumberLiterals() {
     var data =
     """
     1234567890
@@ -177,7 +177,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testRawStringLiterals() throws {
+  func testRawStringLiterals() {
     do {
       var data =
       """
@@ -237,7 +237,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testShebang() throws {
+  func testShebang() {
     var data =
     """
     #!/usr/bin/swiftc
@@ -255,7 +255,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testDocComment() throws {
+  func testDocComment() {
     var data =
     """
     /** hello */
@@ -274,7 +274,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testMain() throws {
+  func testMain() {
     var data =
     """
     /* TestApp */
@@ -309,7 +309,7 @@ public class LexerTests: XCTestCase {
     }
   }
 
-  func testRegexLexing() throws {
+  func testRegexLexing() {
     let fixtures: [(String, [Lexer.Lexeme])] = [
       ("/abc/", [
         lexeme(.regexLiteral, "/abc/"),

Tests/SwiftParserTest/SyntaxTransformVisitor.swift

@@ -10,7 +10,7 @@ import SwiftParser
 import SwiftSyntax
 
 final class SyntaxTransformVisitorTest: XCTestCase {
-  public func testFunctionCounter() throws {
+  public func testFunctionCounter() {
     struct FuncCounter: SyntaxTransformVisitor {
       public func visitAny(_ node: Syntax) -> Int {
         visitChildren(node).reduce(0, +)
@@ -38,7 +38,7 @@ final class SyntaxTransformVisitorTest: XCTestCase {
     }()
   }
 
-  public func testPrintFunctionType() throws {
+  public func testPrintFunctionType() {
     /// Assuming there is a single functioned declaration in the source file, print the type of that function.
     struct PrintFunctionType: SyntaxTransformVisitor {
       func visitAny(_ node: SwiftSyntax.Syntax) -> String {

Tests/SwiftParserTest/TriviaParserTests.swift

@@ -4,7 +4,7 @@ import XCTest
 
 final class TriviaParserTests: XCTestCase {
 
-  func testTriviaParsing() throws {
+  func testTriviaParsing() {
 
     XCTAssertEqual(
       TriviaParser.parseTrivia("""
@@ -126,7 +126,7 @@ final class TriviaParserTests: XCTestCase {
       ])
   }
 
-  func testRawSyntaxLazyTriviaPieces() throws {
+  func testRawSyntaxLazyTriviaPieces() {
     withParser(source: """
         /// Foo.
         func foo() {
@@ -153,7 +153,7 @@ final class TriviaParserTests: XCTestCase {
 
   }
 
-  func testSyntaxLazyTrivia() throws {
+  func testSyntaxLazyTrivia() {
     let source = """
       /* comment only */
 
@@ -165,7 +165,7 @@ final class TriviaParserTests: XCTestCase {
     ])
   }
 
-  func testUnexpectedSplitting() throws {
+  func testUnexpectedSplitting() {
     XCTAssertEqual(
       TriviaParser.parseTrivia("\u{fffe} ", position: .trailing),
       [