Fix semicolon after some namespace

Remove namespace comment after classes and structs.

gcc/rust/ChangeLog:

	* checks/errors/borrowck/rust-bir-fact-collector.h: Remove spurious
	comment.
	* checks/errors/rust-feature.cc: Likewise.
	* util/optional.h: Likewise.
	* expand/rust-token-tree-desugar.cc (TokenTreeDesugar::visit): Remove
	semicolons on namespace.
	* expand/rust-token-tree-desugar.h: Likewise.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Author: P-E-P

gcc/rust/checks/errors/borrowck/rust-bir-fact-collector.h

@@ -883,7 +883,7 @@ class FactCollector : public Visitor
 
     return region_end;
   }
-}; // namespace BIR
+};
 
 } // namespace BIR
 } // namespace Rust

gcc/rust/checks/errors/rust-feature.cc

@@ -84,7 +84,7 @@ const std::map<std::string, Feature::Name> Feature::name_hash_map = {
   {"exclusive_range_pattern", Feature::Name::EXCLUSIVE_RANGE_PATTERN},
   {"prelude_import", Feature::Name::PRELUDE_IMPORT},
   {"min_specialization", Feature::Name::MIN_SPECIALIZATION},
-}; // namespace Rust
+};
 
 tl::optional<Feature::Name>
 Feature::as_name (const std::string &name)

gcc/rust/expand/rust-token-tree-desugar.cc

@@ -68,5 +68,5 @@ TokenTreeDesugar::visit (Token &tts)
     }
 }
 
-}; // namespace AST
-}; // namespace Rust
+} // namespace AST
+} // namespace Rust

gcc/rust/expand/rust-token-tree-desugar.h

@@ -49,7 +49,7 @@ class TokenTreeDesugar : public DefaultASTVisitor
   virtual void visit (Token &tts) override;
 };
 
-}; // namespace AST
-}; // namespace Rust
+} // namespace AST
+} // namespace Rust
 
 #endif //! RUST_TOKEN_TREE_DESUGAR_H

gcc/rust/util/optional.h

@@ -1364,7 +1364,7 @@ class optional : private detail::optional_move_assign_base<T>,
       this->m_has_value = false;
     }
   }
-}; // namespace tl
+};
 
 /// Compares two optional objects
 template <class T, class U>
@@ -2110,7 +2110,7 @@ template <class T> class optional<T &> {
 
 private:
   T *m_value;
-}; // namespace tl
+};
 
 
 
@@ -2128,4 +2128,4 @@ template <class T> struct hash<tl::optional<T>> {
 };
 } // namespace std
 
-#endif
+#endif