diff --git a/elab_lval.cc b/elab_lval.cc
index b10656442..2cfb98016 100644
--- a/elab_lval.cc
+++ b/elab_lval.cc
@@ -200,7 +200,7 @@ NetAssign_* PEIdent::elaborate_lval(Design*des,
 
 	// Special case: The l-value is an entire memory, or array
 	// slice. This is, in fact, an error in l-values. Detect the
-	// situation by noting if the index count is less then the
+	// situation by noting if the index count is less than the
 	// array dimensions (unpacked).
       if (reg->array_dimensions() > name_tail.index.size()) {
 	    cerr << get_fileline() << ": error: Cannot assign to array "
diff --git a/ivl_target.h b/ivl_target.h
index 32eb0e307..fddcf86f5 100644
--- a/ivl_target.h
+++ b/ivl_target.h
@@ -1800,7 +1800,7 @@ extern int          ivl_scope_time_units(ivl_scope_t net);
  *    dimension.
  *
  *    The ivl_signal_msb/ivl_signal_lsb functions are deprecated
- *    versions that only work with variables that have less then two
+ *    versions that only work with variables that have less than two
  *    dimensions. They will return msb==lsb==0 for scalars.
  *
  * ivl_signal_port
diff --git a/lexor.lex b/lexor.lex
index 64d6f2e3c..01a891437 100644
--- a/lexor.lex
+++ b/lexor.lex
@@ -4,7 +4,7 @@
 
 %{
 /*
- * Copyright (c) 1998-2011 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 1998-2012 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -309,7 +309,7 @@ TU [munpf]
 	    }
       }
 
-	/* If this identifer names a previously declared type, then
+	/* If this identifier names a previously declared type, then
 	   return this as a TYPE_IDENTIFIER instead. */
       if (rc == IDENTIFIER && gn_system_verilog()) {
 	    if (data_type_t*type = pform_test_type_identifier(yylval.text)) {
@@ -377,8 +377,11 @@ TU [munpf]
 		 << "Using SystemVerilog 'N bit vector.  Use at least "
 		 << "-g2005-sv to remove this warning." << endl;
       }
+      generation_t generation_save = generation_flag;
+      generation_flag = GN_VER2005_SV;
       yylval.number = make_unsized_binary(yytext);
-      return BASED_NUMBER; }
+      generation_flag = generation_save;
+      return UNBASED_NUMBER; }
 
 [0-9][0-9_]* {
       yylval.number = make_unsized_dec(yytext);
diff --git a/netmisc.h b/netmisc.h
index 5e96d3c8d..7f34131fa 100644
--- a/netmisc.h
+++ b/netmisc.h
@@ -130,7 +130,7 @@ extern NetExpr *normalize_variable_part_base(const list<long>&indices, NetExpr*b
 					     unsigned long wid, bool is_up);
 /*
  * Calculate a canonicalizing expression for a slice select. The
- * indices array is less then needed to fully address a bit, so the
+ * indices array is less than needed to fully address a bit, so the
  * result is a slice of the packed array. The return value is an
  * expression that gets to the base of the slice, and (lwid) becomes
  * the width of the slice, in bits. For example:
diff --git a/parse.y b/parse.y
index 1058767bb..cce1cffca 100644
--- a/parse.y
+++ b/parse.y
@@ -399,7 +399,7 @@ static void current_function_set_statement(const YYLTYPE&loc, vector<Statement*>
 %token <data_type> TYPE_IDENTIFIER
 %token <discipline> DISCIPLINE_IDENTIFIER
 %token <text>   PATHPULSE_IDENTIFIER
-%token <number> BASED_NUMBER DEC_NUMBER
+%token <number> BASED_NUMBER DEC_NUMBER UNBASED_NUMBER
 %token <realtime> REALTIME
 %token K_PLUS_EQ K_MINUS_EQ K_INCR K_DECR
 %token K_LE K_GE K_EG K_EQ K_NE K_CEQ K_CNE K_LP K_LS K_RS K_RSS K_SG
@@ -686,7 +686,7 @@ class_identifier
   ;
 
   /* The endname after a class declaration is a little tricky because
-     the class name is detected by the lexor as a TYPE_IDENTIFER if it
+     the class name is detected by the lexor as a TYPE_IDENTIFIER if it
      does indeed match a name. */
 class_declaration_endname_opt
   : ':' TYPE_IDENTIFIER
@@ -1245,6 +1245,12 @@ number  : BASED_NUMBER
         | DEC_NUMBER BASED_NUMBER
 	     { $$ = pform_verinum_with_size($1,$2, @2.text, @2.first_line);
 	       based_size = 0; }
+        | UNBASED_NUMBER
+	     { $$ = $1; based_size = 0;}
+        | DEC_NUMBER UNBASED_NUMBER
+	     { yyerror(@1, "error: Unbased SystemVerilog literal cannot have "
+	                   "a size.");
+	       $$ = $1; based_size = 0;}
 	;
 
 open_range_list /* IEEE1800-2005 A.2.11 */
diff --git a/pform.h b/pform.h
index 1ca9aa802..be4d744d8 100644
--- a/pform.h
+++ b/pform.h
@@ -403,7 +403,7 @@ extern svector<PWire*>*pform_make_task_ports(const struct vlltype&loc,
 
 /*
  * The parser uses this function to convert a unary
- * increment/decrement expression to the equivilent compressed
+ * increment/decrement expression to the equivalent compressed
  * assignment statement.
  */
 extern PAssign* pform_compressed_assign_from_inc_dec(const struct vlltype&loc,