Improved int semantic error message with hint (Issue #1926)

Author: NishantBansal2003

src/lpython/semantics/python_ast_to_asr.cpp

@@ -877,9 +877,15 @@ class CommonVisitor : public AST::BaseVisitor<Struct> {
 
         if( !type && raise_error ) {
             if (var_annotation == "int") {
-                throw SemanticError(var_annotation + " type is not supported yet. " , loc);
-            } else
-            { 
+                std::string msg = "Hint: Use i8, i16, i32 or i64 for now. ";
+                diag.add(diag::Diagnostic(
+                    var_annotation + " type is not supported yet. ",
+                    diag::Level::Error, diag::Stage::Semantic, {
+                        diag::Label(msg, {loc})
+                    })
+                );
+                throw SemanticAbort();
+            } else { 
                 throw SemanticError("Unsupported type annotation: " + var_annotation, loc);
             }
         }