Add `bit_field` as a keyword

core/odin/tokenizer/token.odin

@@ -137,6 +137,7 @@ Token_Kind :: enum u32 {
 		Union,       // union
 		Enum,        // enum
 		Bit_Set,     // bit_set
+		Bit_Field,   // bit_field
 		Map,         // map
 		Dynamic,     // dynamic
 		Auto_Cast,   // auto_cast
@@ -270,6 +271,7 @@ tokens := [Token_Kind.COUNT]string {
 	"union",
 	"enum",
 	"bit_set",
+	"bit_field",
 	"map",
 	"dynamic",
 	"auto_cast",

src/tokenizer.cpp

@@ -106,6 +106,7 @@ TOKEN_KIND(Token__KeywordBegin, ""), \
 	TOKEN_KIND(Token_union,       "union"),       \
 	TOKEN_KIND(Token_enum,        "enum"),        \
 	TOKEN_KIND(Token_bit_set,     "bit_set"),     \
+	TOKEN_KIND(Token_bit_field,   "bit_field"),   \
 	TOKEN_KIND(Token_map,         "map"),         \
 	TOKEN_KIND(Token_dynamic,     "dynamic"),     \
 	TOKEN_KIND(Token_auto_cast,   "auto_cast"),   \

src/types.cpp

@@ -4114,8 +4114,10 @@ gb_internal isize check_is_assignable_to_using_subtype(Type *src, Type *dst, isi
 		}
 		if (allow_polymorphic && dst_is_polymorphic) {
 			Type *fb = base_type(type_deref(f->type));
-			if (fb->kind == Type_Struct && fb->Struct.polymorphic_parent == dst) {
-				return true;
+			if (fb->kind == Type_Struct) {
+				if (fb->Struct.polymorphic_parent == dst) {
+					return true;
+				}
 			}
 		}