diff --git a/cmd/tools/measure/parser_speed.v b/cmd/tools/measure/parser_speed.v
index 7b549a7a93..0b82a5d5e7 100644
--- a/cmd/tools/measure/parser_speed.v
+++ b/cmd/tools/measure/parser_speed.v
@@ -10,14 +10,14 @@ fn main() {
 	files := os.args#[1..]
 	if files.len > 0 && files[0].starts_with('@') {
 		lst_path := files[0].all_after('@')
-		listed_files := os.read_file(lst_path)?.split('\n')
-		process_files(listed_files)?
+		listed_files := os.read_file(lst_path)!.split('\n')
+		process_files(listed_files)!
 		return
 	}
-	process_files(files)?
+	process_files(files)!
 }
 
-fn process_files(files []string) ? {
+fn process_files(files []string) ! {
 	mut table := ast.new_table()
 	mut pref := pref.new_preferences()
 	pref.is_fmt = true
diff --git a/examples/sokol/sounds/wav_player.v b/examples/sokol/sounds/wav_player.v
index b73fd83d56..575b8b3b35 100644
--- a/examples/sokol/sounds/wav_player.v
+++ b/examples/sokol/sounds/wav_player.v
@@ -12,13 +12,13 @@ mut:
 fn main() {
 	if os.args.len < 2 {
 		eprintln('Usage: play_wav file1.wav file2.wav ...')
-		play_sounds([os.resource_abs_path('uhoh.wav')])?
+		play_sounds([os.resource_abs_path('uhoh.wav')])!
 		exit(1)
 	}
-	play_sounds(os.args[1..])?
+	play_sounds(os.args[1..])!
 }
 
-fn play_sounds(files []string) ? {
+fn play_sounds(files []string) ! {
 	mut player := Player{}
 	player.init()
 	for f in files {
@@ -31,7 +31,7 @@ fn play_sounds(files []string) ? {
 			eprintln('skipping "$f" (not a .wav file)')
 			continue
 		}
-		player.play_wav_file(f)?
+		player.play_wav_file(f)!
 	}
 	player.stop()
 }
@@ -65,9 +65,9 @@ fn (mut p Player) stop() {
 	p.free()
 }
 
-fn (mut p Player) play_wav_file(fpath string) ? {
+fn (mut p Player) play_wav_file(fpath string) ! {
 	println('> play_wav_file: $fpath')
-	samples := read_wav_file_samples(fpath)?
+	samples := read_wav_file_samples(fpath)!
 	p.finished = true
 	p.samples << samples
 	p.finished = false
@@ -116,10 +116,10 @@ struct RIFFFormat {
 	sub_format            [16]u8 // GUID
 }
 
-fn read_wav_file_samples(fpath string) ?[]f32 {
+fn read_wav_file_samples(fpath string) ![]f32 {
 	mut res := []f32{}
 	// eprintln('> read_wav_file_samples: $fpath -------------------------------------------------')
-	mut bytes := os.read_bytes(fpath)?
+	mut bytes := os.read_bytes(fpath)!
 	mut pbytes := &u8(bytes.data)
 	mut offset := u32(0)
 	rh := unsafe { &RIFFHeader(pbytes) }
diff --git a/examples/v_script.vsh b/examples/v_script.vsh
index cebb3f007f..36bc835769 100755
--- a/examples/v_script.vsh
+++ b/examples/v_script.vsh
@@ -13,24 +13,24 @@ for _ in 0 .. 3 {
 }
 
 println('\nMaking dir "v_script_dir".')
-mkdir('v_script_dir')?
+mkdir('v_script_dir')!
 
 println("\nEntering into v_script_dir and listing it's files.")
-chdir('v_script_dir')?
+chdir('v_script_dir')!
 files := ls('.') or { panic(err) }
 println(files)
 
 println('\nCreating foo.txt')
-create('foo.txt')?
+create('foo.txt')!
 
 println('\nFiles:')
 again_ls := ls('.') or { panic(err) }
 println(again_ls)
 
 println('\nRemoving foo.txt and v_script_dir')
-rm('foo.txt')?
-chdir('../')?
-rmdir('v_script_dir')?
+rm('foo.txt')!
+chdir('../')!
+rmdir('v_script_dir')!
 
 print('\nDoes v_script_dir still exist? ')
 println(exists('v_script_dir'))