Get rid of the '=>' arrow and use '->' everywhere instead.

doc/language/lexical-structure/punctuators.md

@@ -8,7 +8,6 @@ punctuator ::= '.' |
                '::' |
                ';' |
                '->' |
-               '=>' |
                '@' |
                '#' |
                '?' |

doc/language/syntactic-structure/expressions/call.md

@@ -9,6 +9,6 @@ call-argument ::= expression
 ```ebnf
 call-expression-try ::= '?' call-expression-try-catch?
 call-expression-try-catch ::= 'catch' '{' call-expression-try-catch-arm (',' call-expression-try-catch-arm)* ','? '}'
-call-expression-try-catch-arm ::= try-catch-pattern call-expression-try-catch-arm-guard? '=>' expression
+call-expression-try-catch-arm ::= try-catch-pattern call-expression-try-catch-arm-guard? '->' expression
 call-expression-try-catch-arm-guard ::= 'if' expression
 ```

doc/language/syntactic-structure/expressions/control/condition.md

@@ -2,5 +2,5 @@
 
 ```ebnf
 condition-expression ::= 'cond' '{' condition-expression-arm (',' condition-expression-arm)* ','? '}'
-condition-expression-arm ::= expression '=>' expression
+condition-expression-arm ::= expression '->' expression
 ```

doc/language/syntactic-structure/expressions/control/match.md

@@ -2,6 +2,6 @@
 
 ```ebnf
 match-expression ::= 'match' expression '{' match-expression-arm (',' match-expression-arm)* ','? '}'
-match-expression-arm ::= pattern match-expression-arm-guard? '=>' expression
+match-expression-arm ::= pattern match-expression-arm-guard? '->' expression
 match-expression-arm-guard ::= 'if' expression
 ```

doc/language/syntactic-structure/expressions/control/receive.md

@@ -2,7 +2,7 @@
 
 ```ebnf
 receive-expression ::= 'recv' '{' receive-expression-arm (',' receive-expression-arm)* ','? '}' receive-expression-else?
-receive-expression-arm ::= lower-identifier receive-parameter-list receive-expression-arm-guard? '=>' expression ';'
+receive-expression-arm ::= lower-identifier receive-parameter-list receive-expression-arm-guard? '->' expression ';'
 receive-expression-arm-guard ::= 'if' expression
 receive-expression-else ::= 'else' block-expression
 receive-parameter-list ::= '(' (receive-parameter (',' receive-parameter)*)? ')'

doc/language/syntactic-structure/expressions/values/lambda.md

@@ -1,7 +1,7 @@
 # Lambda Expression
 
 ```ebnf
-lambda-expression ::= 'fn' lambda-parameter-list '=>' expression
+lambda-expression ::= 'fn' lambda-parameter-list '->' expression
 lambda-parameter-list ::= '(' (lambda-parameter (',' lambda-parameter)*)? ')'
 lambda-parameter ::= attribute* lambda-parameter-binding
 lambda-parameter-binding ::= lower-identifier |

src/syntax/LanguageLexer.cs

@@ -144,7 +144,6 @@ SyntaxTokenKind.Colon or
             SyntaxTokenKind.ColonColon or
             SyntaxTokenKind.Semicolon or
             SyntaxTokenKind.MinusCloseAngle or
-            SyntaxTokenKind.EqualsCloseAngle or
             SyntaxTokenKind.At or
             SyntaxTokenKind.Hash or
             SyntaxTokenKind.Question or
@@ -461,7 +460,6 @@ private void LexComment(SourceLocation location, ImmutableArray<SyntaxTrivia>.Bu
             ('!', '=') => SyntaxTokenKind.ExclamationEquals,
             ('<', '=') => SyntaxTokenKind.OpenAngleEquals,
             ('=', '=') => SyntaxTokenKind.EqualsEquals,
-            ('=', '>') => SyntaxTokenKind.EqualsCloseAngle,
             ('=', _) => SyntaxTokenKind.Equals,
             _ => default(SyntaxTokenKind?),
         };
@@ -490,7 +488,7 @@ private void LexComment(SourceLocation location, ImmutableArray<SyntaxTrivia>.Bu
             parts++;
         }
 
-        // Handle remaining special operators and custom operators.
+        // Handle remaining special operators, and then custom operators.
         return (parts, ch1, ch2) switch
         {
             (1, '<', _) => (location, SyntaxTokenKind.OpenAngle),

src/syntax/LanguageParser.cs

@@ -1406,7 +1406,7 @@ private LambdaExpressionSyntax ParseLambdaExpression()
     {
         var fn = Read();
         var parms = ParseLambdaParameterList();
-        var arrow = Expect(SyntaxTokenKind.EqualsCloseAngle);
+        var arrow = Expect(SyntaxTokenKind.MinusCloseAngle);
         var body = ParseExpression();
 
         return new(fn, parms, arrow, body);
@@ -1470,7 +1470,7 @@ private ConditionExpressionSyntax ParseConditionExpression()
     private ConditionExpressionArmSyntax ParseConditionExpressionArm()
     {
         var condition = ParseExpression();
-        var arrow = Expect(SyntaxTokenKind.EqualsCloseAngle);
+        var arrow = Expect(SyntaxTokenKind.MinusCloseAngle);
         var body = ParseExpression();
 
         return new(condition, arrow, body);
@@ -1496,7 +1496,7 @@ private ExpressionPatternArmSyntax ParseExpressionPatternArm()
     {
         var pat = ParsePattern();
         var guard = ParseOptional(SyntaxTokenKind.IfKeyword, static @this => @this.ParseExpressionArmGuard());
-        var arrow = Expect(SyntaxTokenKind.EqualsCloseAngle);
+        var arrow = Expect(SyntaxTokenKind.MinusCloseAngle);
         var body = ParseExpression();
 
         return new(pat, guard, arrow, body);
@@ -1531,7 +1531,7 @@ private ReceiveExpressionArmSyntax ParseReceiveExpressionArm()
         var name = ExpectCodeIdentifier();
         var parms = ParseReceiveParameterList();
         var guard = ParseOptional(SyntaxTokenKind.IfKeyword, static @this => @this.ParseExpressionArmGuard());
-        var arrow = Expect(SyntaxTokenKind.EqualsCloseAngle);
+        var arrow = Expect(SyntaxTokenKind.MinusCloseAngle);
         var body = ParseExpression();
 
         return new(name, parms, guard, arrow, body);

src/syntax/SyntaxFacts.cs

@@ -325,7 +325,6 @@ internal static string GetFriendlyName(SyntaxTokenKind kind)
             SyntaxTokenKind.ColonColon => "'::'",
             SyntaxTokenKind.Semicolon => "';'",
             SyntaxTokenKind.MinusCloseAngle => "'->'",
-            SyntaxTokenKind.EqualsCloseAngle => "'=>'",
             SyntaxTokenKind.At => "'@'",
             SyntaxTokenKind.Hash => "'#'",
             SyntaxTokenKind.Question => "'?'",
@@ -378,15 +377,6 @@ internal static string GetFriendlyName(SyntaxTokenKind kind)
             SyntaxTokenKind.RealKeyword => "'real' keyword",
             SyntaxTokenKind.RefKeyword => "'ref' keyword",
             SyntaxTokenKind.StrKeyword => "'str' keyword",
-            SyntaxTokenKind.FriendKeyword => "'friend' keyword",
-            SyntaxTokenKind.MacroKeyword => "'macro' keyword",
-            SyntaxTokenKind.MetaKeyword => "'meta' keyword",
-            SyntaxTokenKind.PragmaKeyword => "'pragma' keyword",
-            SyntaxTokenKind.QuoteKeyword => "'quote' keyword",
-            SyntaxTokenKind.TryKeyword => "'try' keyword",
-            SyntaxTokenKind.UnquoteKeyword => "'unquote' keyword",
-            SyntaxTokenKind.WithKeyword => "'with' keyword",
-            SyntaxTokenKind.YieldKeyword => "'yield' keyword",
             SyntaxTokenKind.UpperIdentifier => "uppercase identifier",
             SyntaxTokenKind.LowerIdentifier => "lowercase identifier",
             SyntaxTokenKind.DiscardIdentifier => "discard identifier",

src/syntax/Tree/SyntaxTokenKind.cs

@@ -23,7 +23,6 @@ public enum SyntaxTokenKind
     ColonColon,
     Semicolon,
     MinusCloseAngle,
-    EqualsCloseAngle,
     At,
     Hash,
     Question,