Rename -vet-identical-cast to -vet-cast; with minor code clean up

src/build_settings.cpp

@@ -742,11 +742,11 @@ enum VetFlags : u64 {
 	VetFlag_UnusedVariables = 1u<<5,
 	VetFlag_UnusedImports   = 1u<<6,
 	VetFlag_Deprecated      = 1u<<7,
-	VetFlag_IdenticalCast   = 1u<<8,
+	VetFlag_Cast            = 1u<<8,
 
 	VetFlag_Unused = VetFlag_UnusedVariables|VetFlag_UnusedImports,
 
-	VetFlag_All = VetFlag_Unused|VetFlag_Shadowing|VetFlag_UsingStmt|VetFlag_Deprecated|VetFlag_IdenticalCast,
+	VetFlag_All = VetFlag_Unused|VetFlag_Shadowing|VetFlag_UsingStmt|VetFlag_Deprecated|VetFlag_Cast,
 
 	VetFlag_Using = VetFlag_UsingStmt|VetFlag_UsingParam,
 };
@@ -770,8 +770,8 @@ u64 get_vet_flag_from_name(String const &name) {
 		return VetFlag_Semicolon;
 	} else if (name == "deprecated") {
 		return VetFlag_Deprecated;
-	} else if (name == "identical-cast") {
+	} else if (name == "cast") {
-		return VetFlag_IdenticalCast;
+		return VetFlag_Cast;
 	}
 	return VetFlag_NONE;
 }

src/check_expr.cpp

@@ -3382,18 +3382,18 @@ gb_internal void check_cast(CheckerContext *c, Operand *x, Type *type, bool forb
 				add_package_dependency(c, "runtime", "gnu_f2h_ieee",       REQUIRE);
 			}
 		}
-		if (forbid_identical && check_vet_flags(c) & VetFlag_IdenticalCast) {
+		// If we check polymorphic procedures, we risk erring on
+		// identical casts that cannot be foreseen or otherwise
+		// forbidden, so just skip them.
+		if (forbid_identical && check_vet_flags(c) & VetFlag_Cast &&
+		    (c->curr_proc_sig == nullptr || !is_type_polymorphic(c->curr_proc_sig))) {
 			Type *src_exact = x->type;
 			Type *dst_exact = type;
 
 			if (src_exact != nullptr &&
-				dst_exact != nullptr &&
+			    dst_exact != nullptr &&
-				// If we check polymorphic procedures, we risk erring on
+			    are_types_identical(src_exact, dst_exact)
-				// identical casts that cannot be foreseen or otherwise
+			) {
-				// forbidden, so just skip them.
-				(c->curr_proc_sig == nullptr || !is_type_polymorphic(c->curr_proc_sig)) &&
-				src_exact == dst_exact)
-			{
 				gbString oper_str = expr_to_string(x->expr);
 				gbString to_type  = type_to_string(dst_exact);
 				error(x->expr, "Unneeded cast of `%s` to identical type `%s`", oper_str, to_type);

src/main.cpp

@@ -300,7 +300,7 @@ enum BuildFlagKind {
 	BuildFlag_VetUsingParam,
 	BuildFlag_VetStyle,
 	BuildFlag_VetSemicolon,
-	BuildFlag_VetIdenticalCast,
+	BuildFlag_VetCast,
 
 	BuildFlag_CustomAttribute,
 	BuildFlag_IgnoreUnknownAttributes,
@@ -500,7 +500,7 @@ gb_internal bool parse_build_flags(Array<String> args) {
 	add_flag(&build_flags, BuildFlag_VetUsingParam,           str_lit("vet-using-param"),           BuildFlagParam_None,    Command__does_check);
 	add_flag(&build_flags, BuildFlag_VetStyle,                str_lit("vet-style"),                 BuildFlagParam_None,    Command__does_check);
 	add_flag(&build_flags, BuildFlag_VetSemicolon,            str_lit("vet-semicolon"),             BuildFlagParam_None,    Command__does_check);
-	add_flag(&build_flags, BuildFlag_VetIdenticalCast,        str_lit("vet-identical-cast"),        BuildFlagParam_None,    Command__does_check);
+	add_flag(&build_flags, BuildFlag_VetCast,                 str_lit("vet-cast"),                  BuildFlagParam_None,    Command__does_check);
 
 	add_flag(&build_flags, BuildFlag_CustomAttribute,         str_lit("custom-attribute"),          BuildFlagParam_String,  Command__does_check, true);
 	add_flag(&build_flags, BuildFlag_IgnoreUnknownAttributes, str_lit("ignore-unknown-attributes"), BuildFlagParam_None,    Command__does_check);
@@ -1154,7 +1154,7 @@ gb_internal bool parse_build_flags(Array<String> args) {
 						case BuildFlag_VetUsingParam:      build_context.vet_flags |= VetFlag_UsingParam;      break;
 						case BuildFlag_VetStyle:           build_context.vet_flags |= VetFlag_Style;           break;
 						case BuildFlag_VetSemicolon:       build_context.vet_flags |= VetFlag_Semicolon;       break;
-						case BuildFlag_VetIdenticalCast:   build_context.vet_flags |= VetFlag_IdenticalCast;   break;
+						case BuildFlag_VetCast:            build_context.vet_flags |= VetFlag_Cast;            break;
 
 						case BuildFlag_CustomAttribute:
 							{
@@ -2247,8 +2247,8 @@ gb_internal void print_show_help(String const arg0, String const &command) {
 		print_usage_line(2, "Errs on unneeded semicolons.");
 		print_usage_line(0, "");
 
-		print_usage_line(1, "-vet-identical-cast");
+		print_usage_line(1, "-vet-cast");
-		print_usage_line(2, "Errs on casting a value to its own type.");
+		print_usage_line(2, "Errs on casting a value to its own type or using `transmute` rather than `cast`.");
 		print_usage_line(0, "");
 	}