diff --git a/test/aggr_tuple_assignment.cpp b/test/aggr_tuple_assignment.cpp
index 4a01ff90..4209a0cf 100644
--- a/test/aggr_tuple_assignment.cpp
+++ b/test/aggr_tuple_assignment.cpp
@@ -50,8 +50,8 @@ struct string_int_double_priv
     std::string s;
 
 private:
-    int i;
-    double d;
+    [[maybe_unused]] int i;
+    [[maybe_unused]] double d;
 };
 
 struct string_int_double_no_copy_move
@@ -62,8 +62,8 @@ struct string_int_double_no_copy_move
 
 private:
     std::string s;
-    int i;
-    double d;
+    [[maybe_unused]] int i;
+    [[maybe_unused]] double d;
 };
 
 struct employee
diff --git a/test/github_issues.cpp b/test/github_issues.cpp
index 917a8621..e8f7ea30 100644
--- a/test/github_issues.cpp
+++ b/test/github_issues.cpp
@@ -182,7 +182,7 @@ void github_issue_78()
 
 namespace issue_90 { namespace parser {
     const auto string =
-        '"' >> boost::parser::lexeme[*(boost::parser::char_ - '"')] > '"';
+        ('"' >> boost::parser::lexeme[*(boost::parser::char_ - '"')]) > '"';
     const auto specifier = string > ':' > string;
 }}
 
diff --git a/test/parser.cpp b/test/parser.cpp
index 6450e7d4..4d8616fe 100644
--- a/test/parser.cpp
+++ b/test/parser.cpp
@@ -2842,10 +2842,10 @@ int main()
             };
 
             namespace bp = boost::parser;
-            std::variant<key_value, double> kv_or_d;
             key_value kv;
             bp::parse("42 13.0", bp::int_ >> bp::double_, kv); // Ok.
 #if 0
+            std::variant<key_value, double> kv_or_d;
             bp::parse("42 13.0", bp::int_ >> bp::double_, kv_or_d); // Error: ill-formed!
 #endif
         }
diff --git a/test/parser_rule.cpp b/test/parser_rule.cpp
index e9c15fab..974be19b 100644
--- a/test/parser_rule.cpp
+++ b/test/parser_rule.cpp
@@ -124,7 +124,7 @@ namespace more_about_rules_3 {
 
     bp::rule<struct parens_tag> parens = "matched parentheses";
 
-    auto const parens_def = ('(' >> parens > ')') | bp::eps;
+    auto const parens_def = (('(' >> parens) > ')') | bp::eps;
 
     BOOST_PARSER_DEFINE_RULES(parens);
 }
@@ -134,7 +134,7 @@ namespace more_about_rules_4 {
 
     bp::rule<struct parens_tag> parens = "matched parentheses";
 
-    auto const parens_def = ('(' >> parens > ')') | bp::eps;
+    auto const parens_def = (('(' >> parens) > ')') | bp::eps;
 
     BOOST_PARSER_DEFINE_RULES(parens);