[strong] Less pleading error messages

src/messages.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // -------------------------------------------------------------------
 
 var kMessages = {
   // Error
   cyclic_proto:                  ["Cyclic __proto__ value"],
   code_gen_from_strings:         ["%0"],
@@ skipping 146 matching lines @@
   strict_param_dupe:             ["Strict mode function may not have duplicate parameter names"],
   strict_octal_literal:          ["Octal literals are not allowed in strict mode."],
   template_octal_literal:        ["Octal literals are not allowed in template strings."],
   strict_delete:                 ["Delete of an unqualified identifier in strict mode."],
   strict_delete_property:        ["Cannot delete property '", "%0", "' of ", "%1"],
   strict_function:               ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
   strict_read_only_property:     ["Cannot assign to read only property '", "%0", "' of ", "%1"],
   strict_cannot_assign:          ["Cannot assign to read only '", "%0", "' in strict mode"],
   strict_poison_pill:            ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
   strict_caller:                 ["Illegal access to a strict mode caller function."],
-  strong_ellision:               ["Please don't use arrays with holes in strong mode, use maps instead"],
-  strong_arguments:              ["Please don't use 'arguments' in strong mode, use '...args' instead"],
-  strong_equal:                  ["Please don't use '==' or '!=' in strong mode, use '===' or '!==' instead"],
-  strong_delete:                 ["Please don't use 'delete' in strong mode, use maps or sets instead"],
-  strong_var:                    ["Please don't use 'var' in strong mode, use 'let' or 'const' instead"],
-  strong_for_in:                 ["Please don't use 'for'-'in' loops in strong mode, use 'for'-'of' instead"],
-  strong_empty:                  ["Please don't use empty sub-statements in strong mode, make them explicit with '{}' instead"],
-  strong_use_before_declaration: ["Please declare variable '", "%0", "' before use in strong mode"],
-  strong_super_call_missing:     ["Please always invoke the super constructor in subclasses in strong mode"],
-  strong_super_call_duplicate:   ["Please don't invoke the super constructor multiple times in strong mode"],
-  strong_super_call_nested:      ["Please don't invoke the super constructor nested inside another statement or expression in strong mode"],
-  strong_constructor_return_value: ["Please do not return a value from a constructor in strong mode"],
-  strong_constructor_return_misplaced: ["Please do not return from a constructor before its super constructor invocation in strong mode"],
+  strong_ellision:               ["In strong mode, arrays with holes are deprecated, use maps instead"],
+  strong_arguments:              ["In strong mode, 'arguments' is deprecated, use '...args' instead"],
+  strong_equal:                  ["In strong mode, '==' and '!=' are deprecated, use '===' and '!==' instead"],
+  strong_delete:                 ["In strong mode, 'delete' is deprecated, use maps or sets instead"],
+  strong_var:                    ["In strong mode, 'var' is deprecated, use 'let' or 'const' instead"],
+  strong_for_in:                 ["In strong mode, 'for'-'in' loops are deprecated, use 'for'-'of' instead"],
+  strong_empty:                  ["In strong mode, empty sub-statements are deprecated, make them explicit with '{}' instead"],
+  strong_use_before_declaration: ["In strong mode, declaring variable '", "%0", "' before its use is required"],
+  strong_super_call_missing:     ["In strong mode, invoking the super constructor in a subclass is required"],
+  strong_super_call_duplicate:   ["In strong mode, invoking the super constructor multiple times is deprecated"],
+  strong_super_call_nested:      ["In strong mode, invoking the super constructor nested inside another statement or expression is deprecated"],
+  strong_constructor_return_value: ["In strong mode, returning a value from a constructor is deprecated"],
+  strong_constructor_return_misplaced: ["In strong mode, returning from a constructor before its super constructor invocation is deprecated"],
   sloppy_lexical:                ["Block-scoped declarations (let, const, function, class) not yet supported outside strict mode"],
   malformed_arrow_function_parameter_list: ["Malformed arrow function parameter list"],
   generator_poison_pill:         ["'caller' and 'arguments' properties may not be accessed on generator functions."],
   cant_prevent_ext_external_array_elements: ["Cannot prevent extension of an object with external array elements"],
   redef_external_array_element:  ["Cannot redefine a property of an object with external array elements"],
   const_assign:                  ["Assignment to constant variable."],
   symbol_to_string:              ["Cannot convert a Symbol value to a string"],
   symbol_to_primitive:           ["Cannot convert a Symbol wrapper object to a primitive value"],
   symbol_to_number:              ["Cannot convert a Symbol value to a number"],
   module_export_undefined:       ["Export '", "%0", "' is not defined in module"],
@@ skipping 1137 matching lines @@
 function SetUpStackOverflowBoilerplate() {
   var boilerplate = MakeRangeError('stack_overflow', []);
 
   %DefineAccessorPropertyUnchecked(
       boilerplate, 'stack', StackTraceGetter, StackTraceSetter, DONT_ENUM);
 
   return boilerplate;
 }
 
 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();