Add hint for Cpp1 new expressions, closes #418

With thanks to @ntrel, thanks Nick!

Author: hsutter

regression-tests/test-results/version

@@ -1,10 +1,10 @@
 
-cppfront compiler v0.2.1   Build 8520:0928
+cppfront compiler v0.2.1   Build 8520:1228
 Copyright(c) Herb Sutter   All rights reserved
 
 SPDX-License-Identifier: CC-BY-NC-ND-4.0
   No commercial use
   No forks/derivatives
-FAQ: Why? Because this is a personal experiment at this time
+  (At this time, while this is a personal experiment)
 
 Absolutely no warranty - try at your own risk

source/build.info

@@ -1 +1 @@
-"8520:0928"
+"8520:1228"

source/common.h

@@ -777,7 +777,8 @@ class cmdline_processor
         print("\nSPDX-License-Identifier: CC-BY-NC-ND-4.0");
         print("\n  No commercial use");
         print("\n  No forks/derivatives");
-        print("\nFAQ: Why? Because this is a personal experiment at this time\n");
+        print("\n  Note: This license emphasizes that this is a personal");
+        print("\n        experiment; it will be upgraded if that changes\n");
         print("\nAbsolutely no warranty - try at your own risk\n");
     }
 

source/parse.h

@@ -3776,7 +3776,7 @@ class parser
                 }
                 if (curr().type() != lexeme::RightBracket)
                 {
-                    error("unexpected text - [ is not properly matched by ]");
+                    error("unexpected text - [ is not properly matched by ]", true, {}, true);
                     return {};
                 }
                 term.expr_list->close_paren = &curr();
@@ -3791,7 +3791,7 @@ class parser
                     return {};
                 }
                 if (curr().type() != lexeme::RightParen) {
-                    error("unexpected text - ( is not properly matched by )");
+                    error("unexpected text - ( is not properly matched by )", true, {}, true);
                     return {};
                 }
                 term.expr_list->close_paren = &curr();
@@ -4469,6 +4469,13 @@ class parser
             next();
         }
 
+        else {
+            if (*n->identifier == "new") {
+                error( "use 'new<" + curr().to_string(true) + ">', not 'new " + curr().to_string(true) + "'", false);
+                return {};
+            }
+        }
+
         return n;
     }