Butcher narrow cast a little (don't print value).

Also remove some forward declarations from util/types.hpp
If they don't work properly, it's easier to remove them.

Utilities/BitField.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "util/types.hpp"
+#include "Utilities/StrFmt.h"
 
 template<typename T, uint N>
 struct bf_base

Utilities/StrFmt.cpp

@@ -294,29 +294,21 @@ void fmt_class_string<src_loc>::format(std::string& out, u64 arg)
 
 namespace fmt
 {
-	void raw_verify_error(const src_loc& loc)
+	[[noreturn]] void raw_verify_error(const src_loc& loc)
 	{
 		std::string out{"Verification failed"};
 		fmt::append(out, "%s", loc);
 		thread_ctrl::emergency_exit(out);
 	}
 
-	void raw_narrow_error(const src_loc& loc, const fmt_type_info* sup, u64 arg)
+	[[noreturn]] void raw_narrow_error(const src_loc& loc)
 	{
 		std::string out{"Narrowing error"};
-
-		if (sup)
-		{
-			out += " (";
-			sup->fmt_string(out, arg); // Print value
-			out += ")";
-		}
-
 		fmt::append(out, "%s", loc);
 		thread_ctrl::emergency_exit(out);
 	}
 
-	void raw_throw_exception(const src_loc& loc, const char* fmt, const fmt_type_info* sup, const u64* args)
+	[[noreturn]] void raw_throw_exception(const src_loc& loc, const char* fmt, const fmt_type_info* sup, const u64* args)
 	{
 		std::string out;
 		raw_append(out, fmt, sup, args);

Utilities/StrFmt.h

@@ -10,7 +10,7 @@ namespace fmt
 	static std::string format(const CharT(&)[N], const Args&...);
 }
 
-template <typename T, typename>
+template <typename T, typename = void>
 struct fmt_unveil
 {
 	static_assert(sizeof(T) > 0, "fmt_unveil<> error: incomplete type");
@@ -245,6 +245,9 @@ struct fmt_type_info
 template <typename... Args>
 using fmt_args_t = const u64(&&)[sizeof...(Args) + 1];
 
+template <typename Arg>
+using fmt_unveil_t = typename fmt_unveil<Arg>::type;
+
 namespace fmt
 {
 	// Base-57 format helper

Utilities/bit_set.h

@@ -23,6 +23,7 @@ Intersection (&) and symmetric difference (^) is also available.
 
 #include "util/types.hpp"
 #include "util/atomic.hpp"
+#include "Utilities/StrFmt.h"
 
 template <typename T>
 class atomic_bs_t;