feat(wgsl-in): add unimpl. diag. for compound stmt. @diagnostic(…)s

naga/src/front/wgsl/parse/mod.rs

@@ -2159,6 +2159,21 @@ impl Parser {
 
         ctx.local_table.push_scope();
 
+        while lexer.skip(Token::Attribute) {
+            let (name, name_span) = lexer.next_ident_with_span()?;
+            if let Some(DirectiveKind::Diagnostic) = DirectiveKind::from_ident(name) {
+                return Err(Error::DiagnosticNotYetImplementedAtParseSite {
+                    site_name_plural: "compound statements",
+                    span: name_span,
+                });
+            } else {
+                return Err(Error::Unexpected(
+                    name_span,
+                    ExpectedToken::DiagnosticAttribute,
+                ));
+            }
+        }
+
         let brace_span = lexer.expect_span(Token::Paren('{'))?;
         let brace_nesting_level = Self::increase_brace_nesting(brace_nesting_level, brace_span)?;
         let mut block = ast::Block::default();