diff --git a/doc/docs.md b/doc/docs.md
index cb9b10110f..b36becd6d0 100644
--- a/doc/docs.md
+++ b/doc/docs.md
@@ -5324,7 +5324,7 @@ Full list of builtin options:
 import os
 fn main() {
 	embedded_file := $embed_file('v.png')
-	os.write_file('exported.png', embedded_file.to_string())?
+	os.write_file('exported.png', embedded_file.to_string())!
 }
 ```
 
@@ -5348,7 +5348,7 @@ Currently only one compression type is supported: `zlib`
 import os
 fn main() {
 	embedded_file := $embed_file('v.png', .zlib) // compressed using zlib
-	os.write_file('exported.png', embedded_file.to_string())?
+	os.write_file('exported.png', embedded_file.to_string())!
 }
 ```
 
diff --git a/thirdparty/stdatomic/nix/cpp/gen.v b/thirdparty/stdatomic/nix/cpp/gen.v
index 44e0f24fbe..7d5d9d268b 100644
--- a/thirdparty/stdatomic/nix/cpp/gen.v
+++ b/thirdparty/stdatomic/nix/cpp/gen.v
@@ -84,16 +84,16 @@ fn find_file(search_paths []string, file string) ?string {
 	return error('${file} not found')
 }
 
-fn patch_atomic(outfile string, infile string) ? {
-	lines := os.read_file(infile)?.split('\n')
+fn patch_atomic(outfile string, infile string) ! {
+	lines := os.read_file(infile)!.split('\n')
 	outlines := lines.filter(!it.contains('atomic(const atomic&) = delete;'))
 	outtext := outlines.join('\n').replace('#include <bits/atomic_base.h>', '#include "bitsatomicbase.h"')
-	os.write_file(outfile, outtext)?
+	os.write_file(outfile, outtext)!
 }
 
-fn patch_bitsatomicbase(outfile string, infile string) ? {
-	lines := os.read_file(infile)?.split('\n')
+fn patch_bitsatomicbase(outfile string, infile string) ! {
+	lines := os.read_file(infile)!.split('\n')
 	outlines := lines.filter(!it.contains('__atomic_base(const __atomic_base&) = delete;'))
 	outtext := outlines.join('\n').replace('#include <bits/atomic_base.h>', '#include "bitsatomicbase.h"')
-	os.write_file(outfile, outtext)?
+	os.write_file(outfile, outtext)!
 }
diff --git a/vlib/v/slow_tests/crun_mode/crun_test.v b/vlib/v/slow_tests/crun_mode/crun_test.v
index b957d5b1a1..0ec3be95a9 100644
--- a/vlib/v/slow_tests/crun_mode/crun_test.v
+++ b/vlib/v/slow_tests/crun_mode/crun_test.v
@@ -21,7 +21,7 @@ fn testsuite_end() {
 }
 
 fn test_saving_simple_v_program() {
-	os.write_file(vprogram_file, 'print("hello")')?
+	os.write_file(vprogram_file, 'print("hello")')!
 	assert true
 }
 
diff --git a/vlib/v/tests/closure_generator_test.v b/vlib/v/tests/closure_generator_test.v
index 47e4a515fa..5e9a264dfd 100644
--- a/vlib/v/tests/closure_generator_test.v
+++ b/vlib/v/tests/closure_generator_test.v
@@ -165,7 +165,7 @@ fn test_closure_return_${styp}_${i}() ? {
 	wrkdir := os.join_path(os.vtmp_dir(), 'v', 'tests', 'closures')
 	os.mkdir_all(wrkdir)?
 	os.chdir(wrkdir)?
-	os.write_file('closure_return_test.v', code)?
+	os.write_file('closure_return_test.v', code)!
 	vexe := os.getenv('VEXE')
 	res := os.execute('${os.quoted_path(vexe)} -keepc -cg -showcc closure_return_test.v')
 	if res.exit_code != 0 {