diff --git a/lib/std/io/os/chdir.c3 b/lib/std/io/os/chdir.c3
new file mode 100644
index 000000000..2f3dd4f9d
--- /dev/null
+++ b/lib/std/io/os/chdir.c3
@@ -0,0 +1,42 @@
+module std::io::os;
+import libc;
+
+
+$if (!env::COMPILER_LIBC_AVAILABLE):
+
+fn void! native_chdir(Path path)
+{
+	unreachable("'getcwd' not available");
+}
+
+$elif (env::OS_TYPE == OsType.WIN32):
+
+macro void! native_chdir(Path path)
+{
+	@pool()
+	{
+		 if (files::win32_SetCurrentDirectoryW(path.as_str().to_temp_utf16()!!)) return;
+	};
+	return IoError.GENERAL_ERROR!;
+}
+
+$else:
+
+extern fn int _chdir(ZString) @extern("chdir");
+macro void! native_chdir(Path p)
+{
+	if (_chdir((ZString)p.as_str()))
+	{
+		switch (libc::errno())
+		{
+			case errno::EACCES: return IoError.NO_PERMISSION!;
+			case errno::ENAMETOOLONG: return IoError.NAME_TOO_LONG!;
+			case errno::ENOTDIR: return IoError.FILE_NOT_DIR!;
+			case errno::ENOENT: return IoError.FILE_NOT_FOUND!;
+			case errno::ELOOP: return IoError.SYMLINK_FAILED!;
+			default: return IoError.GENERAL_ERROR!;
+		}
+	}
+}
+
+$endif;
\ No newline at end of file
diff --git a/lib/std/io/path.c3 b/lib/std/io/path.c3
index 4ad25d09a..20cac6977 100644
--- a/lib/std/io/path.c3
+++ b/lib/std/io/path.c3
@@ -40,6 +40,7 @@ fn bool is_file(Path path) => os::native_is_file(path.as_str());
 fn usz! file_size(Path path) => os::native_file_size(path.as_str());
 fn bool exists(Path path) => os::native_file_or_dir_exists(path.as_str());
 fn Path! tgetcwd() => getcwd(mem::temp()) @inline;
+fn void! chdir(Path path) => os::native_chdir(path) @inline;
 fn Path! temp_directory(Allocator* using = mem::heap()) => os::native_temp_directory(using);
 
 macro bool is_separator(char c, PathEnv path_env = DEFAULT_PATH_ENV)
diff --git a/lib/std/os/win32/files.c3 b/lib/std/os/win32/files.c3
index 2e905f682..5b74146a7 100644
--- a/lib/std/os/win32/files.c3
+++ b/lib/std/os/win32/files.c3
@@ -27,6 +27,7 @@ struct Win32_FILE_ATTRIBUTE_DATA
 extern fn bool win32_GetFileAttributesExW(Win32_LPCWSTR, Win32_GET_FILEEX_INFO_LEVELS, Win32_LPVOID) @extern("GetFileAttributesExW");
 extern fn bool win32_PathFileExistsW(Win32_LPCWSTR) @extern("PathFileExistsW");
 extern fn Win32_DWORD win32_GetTempPathW(Win32_DWORD nBufferLength, Win32_LPWSTR lpBuffer) @extern("GetTempPathW");
+extern fn bool win32_SetCurrentDirectoryW(Win32_LPCTSTR buffer) @extern("SetCurrentDirectoryW");
 
 /*
 extern ulong _win32_GetCurrentDirectoryW(ulong, Char16* buffer) @extern("GetCurrentDirectoryW");
diff --git a/src/build/build_options.c b/src/build/build_options.c
index 52c6725a5..073de73b9 100644
--- a/src/build/build_options.c
+++ b/src/build/build_options.c
@@ -898,6 +898,10 @@ BuildOptions parse_arguments(int argc, const char *argv[])
 		}
 		FAIL_WITH_ERR("Found the unexpected argument \"%s\".", current_arg);
 	}
+	if (build_options.command == COMMAND_MISSING)
+	{
+		FAIL_WITH_ERR("Missing a compiler command such as 'compile' or 'build'.");
+	}
 	return build_options;
 }
 
diff --git a/src/compiler/sema_expr.c b/src/compiler/sema_expr.c
index 8728c1559..194fae449 100644
--- a/src/compiler/sema_expr.c
+++ b/src/compiler/sema_expr.c
@@ -931,6 +931,24 @@ static inline bool sema_binary_promote_top_down(SemaContext *context, Expr *bina
 
 static inline bool sema_binary_analyse_subexpr(SemaContext *context, Expr *binary, Expr *left, Expr *right)
 {
+	// Special handling of f = FOO_BAR
+	if (right->expr_kind == EXPR_IDENTIFIER && right->identifier_expr.is_const)
+	{
+		if (!sema_analyse_expr(context, left)) return false;
+		if (type_flatten(left->type)->type_kind == TYPE_ENUM)
+		{
+			return sema_analyse_inferred_expr(context, left->type, right);
+		}
+	}
+	// Special handling of f = FOO_BAR
+	if (left->expr_kind == EXPR_IDENTIFIER && left->identifier_expr.is_const)
+	{
+		if (!sema_analyse_expr(context, right)) return false;
+		if (type_flatten(right->type)->type_kind == TYPE_ENUM)
+		{
+			return sema_analyse_inferred_expr(context, right->type, left);
+		}
+	}
 	if (right->expr_kind == EXPR_INITIALIZER_LIST)
 	{
 		if (!sema_analyse_expr(context, left)) return false;
@@ -2103,11 +2121,11 @@ static inline bool sema_expr_analyse_call(SemaContext *context, Expr *expr)
 		case EXPR_TYPEINFO:
 			if (func_expr->type_expr->resolve_status == RESOLVE_DONE)
 			{
-				SEMA_ERROR(expr, "A type cannot be followed by (), if you intended a cast, use (type)(expression).");
+				SEMA_ERROR(expr, "A type cannot be followed by (), if you intended a cast, use '(type) expression'.");
 			}
 			else
 			{
-				SEMA_ERROR(expr, "A type cannot be followed by (), did you mean to use {}?");
+				SEMA_ERROR(expr, "A type cannot be followed by (), did you mean to use 'type {}'?");
 			}
 			return false;
 		default:
diff --git a/src/compiler/sema_initializers.c b/src/compiler/sema_initializers.c
index 672842837..7007d8e16 100644
--- a/src/compiler/sema_initializers.c
+++ b/src/compiler/sema_initializers.c
@@ -528,6 +528,7 @@ bool sema_expr_analyse_initializer_list(SemaContext *context, Type *to, Expr *ex
 	if (!to) to = type_untypedlist;
 	assert(to);
 	Type *flattened = type_flatten(to);
+	bool is_zero_init = expr->expr_kind == EXPR_INITIALIZER_LIST && !vec_size(expr->initializer_list);
 	switch (flattened->type_kind)
 	{
 		case TYPE_UNTYPED_LIST:
@@ -541,7 +542,7 @@ bool sema_expr_analyse_initializer_list(SemaContext *context, Type *to, Expr *ex
 			return sema_expr_analyse_initializer(context, to, flattened, expr);
 		case TYPE_SUBARRAY:
 		{
-			if (expr->expr_kind == EXPR_INITIALIZER_LIST && !vec_size(expr->initializer_list))
+			if (is_zero_init)
 			{
 				expr->expr_kind = EXPR_CONST;
 				expr->const_expr.const_kind = CONST_POINTER;
@@ -561,12 +562,31 @@ bool sema_expr_analyse_initializer_list(SemaContext *context, Type *to, Expr *ex
 			SEMA_ERROR(expr, "Scaled vectors cannot be initialized using an initializer list, since the length is not known at compile time.");
 			return false;
 		case TYPE_POINTER:
+			if (is_zero_init)
+			{
+				expr_rewrite_to_const_zero(expr, to);
+				return true;
+			}
 			SEMA_ERROR(expr, "Pointers cannot be initialized using an initializer list, instead you need to take the address of an array.");
 			return false;
+		case TYPE_VOID:
+		case TYPE_POISONED:
+		case TYPE_FUNC:
+		case TYPE_TYPEDEF:
+		case TYPE_OPTIONAL_ANY:
+		case TYPE_OPTIONAL:
+		case TYPE_TYPEINFO:
+		case TYPE_MEMBER:
+			break;
 		default:
+			if (is_zero_init)
+			{
+				expr_rewrite_to_const_zero(expr, flattened);
+				expr->type = to;
+				return true;
+			}
 			break;
 	}
-	// Fix error on compound literals
 	SEMA_ERROR(expr, "'%s' cannot use compound literal initialization, did you intend to use a cast?", type_to_error_string(to));
 	return false;
 }
diff --git a/src/compiler/sema_stmts.c b/src/compiler/sema_stmts.c
index dcd17b25b..8e3eee321 100644
--- a/src/compiler/sema_stmts.c
+++ b/src/compiler/sema_stmts.c
@@ -367,7 +367,7 @@ static inline bool sema_analyse_block_exit_stmt(SemaContext *context, Ast *state
 	}
 	else
 	{
-		if (block_type && block_type != type_void)
+		if (block_type && type_no_optional(block_type) != type_void)
 		{
 			SEMA_ERROR(statement, "Expected a return value of type %s here.", type_quoted_error_string(block_type));
 			return false;
@@ -966,9 +966,24 @@ static inline bool sema_analyse_cond(SemaContext *context, Expr *expr, CondType
 		}
 		return true;
 	}
+
 	// 3a. Check for optional in case of an expression.
 	if (IS_OPTIONAL(last))
 	{
+		if (type_no_optional(last->type) == type_void && cast_to_bool)
+		{
+			Expr *catch = expr_new_expr(EXPR_CATCH, last);
+			catch->expr_kind = EXPR_CATCH;
+			catch->inner_expr = expr_copy(last);
+			catch->type = type_anyerr;
+			catch->resolve_status = RESOLVE_DONE;
+			catch->inner_expr->resolve_status = RESOLVE_DONE;
+			last->expr_kind = EXPR_UNARY;
+			last->unary_expr.operator = UNARYOP_NOT;
+			last->unary_expr.expr = catch;
+			last->type = type_bool;
+			return true;
+		}
 		SEMA_ERROR(last, "The expression may not be an optional, but was %s.", type_quoted_error_string(last->type));
 		return false;
 	}
diff --git a/src/version.h b/src/version.h
index c734d6925..03d257220 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define COMPILER_VERSION "0.4.107"
\ No newline at end of file
+#define COMPILER_VERSION "0.4.108"
\ No newline at end of file
diff --git a/test/test_suite/cast/cast_parse_fails.c3 b/test/test_suite/cast/cast_parse_fails.c3
index e52fbad02..f807aa354 100644
--- a/test/test_suite/cast/cast_parse_fails.c3
+++ b/test/test_suite/cast/cast_parse_fails.c3
@@ -7,7 +7,7 @@ fn void test2()
 
 fn void test3()
 {
-    int x = int(32);    // #error: A type cannot be followed by (), if you intended a cast, use (type)(expression)
+    int x = int(32);    // #error: A type cannot be followed by (), if you intended a cast, use '(type) expression'
 }
 
 
diff --git a/test/test_suite/cast/cast_parse_fails2.c3 b/test/test_suite/cast/cast_parse_fails2.c3
index 020eeb416..883deaee8 100644
--- a/test/test_suite/cast/cast_parse_fails2.c3
+++ b/test/test_suite/cast/cast_parse_fails2.c3
@@ -4,5 +4,5 @@ struct Foo { int a; }
 fn void test1()
 {
     (Foo)({ 32 });
-    Foo({ 32 }); // #error: A type cannot be followed by (), if you intended a cast, use (type)(expression)
+    Foo({ 32 }); // #error: A type cannot be followed by (), if you intended a cast, use '(type) expression'
 }
\ No newline at end of file