fix(lexers/go): "~" is a valid token (#926)

With the introduction of generics,
tilde is a valid punctuation token in Go programs.
https://go.dev/ref/spec#Operators_and_punctuation

This updates the punctuation regex for the Go lexer,
and adds a test to ensure that it's treated as such.

Author: abhinav

lexers/go.go

@@ -55,7 +55,7 @@ func goRules() Rules {
 			{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
 			{`(<<=|>>=|<<|>>|<=|>=|&\^=|&\^|\+=|-=|\*=|/=|%=|&=|\|=|&&|\|\||<-|\+\+|--|==|!=|:=|\.\.\.|[+\-*/%&])`, Operator, nil},
 			{`([a-zA-Z_]\w*)(\s*)(\()`, ByGroups(NameFunction, UsingSelf("root"), Punctuation), nil},
-			{`[|^<>=!()\[\]{}.,;:]`, Punctuation, nil},
+			{`[|^<>=!()\[\]{}.,;:~]`, Punctuation, nil},
 			{`[^\W\d]\w*`, NameOther, nil},
 		},
 	}

lexers/testdata/go.actual

@@ -15,4 +15,8 @@ func hello(a int) {
     return func() int {
         return i
     }
-} // One last thing
+} // One last thing
+
+type Int interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64
+}

lexers/testdata/go.expected

@@ -84,5 +84,39 @@
   {"type":"Text","value":"\n"},
   {"type":"Punctuation","value":"}"},
   {"type":"Text","value":" "},
-  {"type":"CommentSingle","value":"// One last thing\n"}
+  {"type":"CommentSingle","value":"// One last thing\n"},
+  {"type":"Text","value":"\n"},
+  {"type":"KeywordDeclaration","value":"type"},
+  {"type":"Text","value":" "},
+  {"type":"NameOther","value":"Int"},
+  {"type":"Text","value":" "},
+  {"type":"KeywordDeclaration","value":"interface"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"{"},
+  {"type":"Text","value":"\n\t"},
+  {"type":"Punctuation","value":"~"},
+  {"type":"KeywordType","value":"int"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"|"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"~"},
+  {"type":"KeywordType","value":"int8"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"|"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"~"},
+  {"type":"KeywordType","value":"int16"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"|"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"~"},
+  {"type":"KeywordType","value":"int32"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"|"},
+  {"type":"Text","value":" "},
+  {"type":"Punctuation","value":"~"},
+  {"type":"KeywordType","value":"int64"},
+  {"type":"Text","value":"\n"},
+  {"type":"Punctuation","value":"}"},
+  {"type":"Text","value":"\n"}
 ]