[clang][NFC] simplify the check for ParseLabeledStatement

HerrCai0907 · HerrCai0907 · commit 61d17293801b · 2024-11-23T19:51:50.000+08:00
`!isInvalid &amp;&amp; !isUsable -&gt; !isInvalid &amp;&amp; !(!isInvalid &amp;&amp; !isUnset) -&gt; isUnset`
It is more simple to understand.
diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
@@ -799,7 +799,7 @@ StmtResult Parser::ParseLabeledStatement(ParsedAttributes &Attrs,
   }
 
   // If we've not parsed a statement yet, parse one now.
-  if (!SubStmt.isInvalid() && !SubStmt.isUsable())
+  if (SubStmt.isUnset())
     SubStmt = ParseStatement(nullptr, StmtCtx);
 
   // Broken substmt shouldn't prevent the label from being added to the AST.

Original file line number	Diff line number	Diff line change
`@@ -799,7 +799,7 @@ StmtResult Parser::ParseLabeledStatement(ParsedAttributes &Attrs,`
`799`	`799`	`}`
`800`	`800`
`801`	`801`	`// If we've not parsed a statement yet, parse one now.`
`802`		`- if (!SubStmt.isInvalid() && !SubStmt.isUsable())`
	`802`	`+ if (SubStmt.isUnset())`
`803`	`803`	`SubStmt = ParseStatement(nullptr, StmtCtx);`
`804`	`804`
`805`	`805`	`// Broken substmt shouldn't prevent the label from being added to the AST.`