diff --git a/cmd/tools/check_os_api_parity.v b/cmd/tools/check_os_api_parity.v
index 4980dde63e..d4b925c66f 100644
--- a/cmd/tools/check_os_api_parity.v
+++ b/cmd/tools/check_os_api_parity.v
@@ -2,6 +2,7 @@ module main
 
 import os
 import v.util
+import v.util.diff
 import v.pref
 import v.builder
 import v.ast
@@ -13,6 +14,7 @@ const (
 	os_names     = ['linux', 'macos', 'windows']
 	skip_modules = [
 		'builtin.bare',
+		'builtin.linux_bare.old',
 		'builtin.js',
 		'strconv',
 		'strconv.ftoa',
@@ -41,7 +43,7 @@ fn main() {
 	vroot := os.dir(vexe)
 	util.set_vroot_folder(vroot)
 	os.chdir(vroot)
-	cmd := util.find_working_diff_command() or { '' }
+	cmd := diff.find_working_diff_command() or { '' }
 	mut app := App{
 		diff_cmd: cmd
 		is_verbose: os.getenv('VERBOSE').len > 0
@@ -117,7 +119,7 @@ fn (app App) gen_api_for_module_in_os(mod_name string, os_name string) string {
 }
 
 fn (mut app App) compare_api(api_base string, api_os string, mod_name string, os_base string, os_target string) {
-	res := util.color_compare_strings(app.diff_cmd, rand.ulid(), api_base, api_os)
+	res := diff.color_compare_strings(app.diff_cmd, rand.ulid(), api_base, api_os)
 	if res.len > 0 {
 		summary := 'Different APIs found for module: `$mod_name`, between OS base: `$os_base` and OS: `$os_target`'
 		eprintln(term.header(summary, '-'))
diff --git a/cmd/tools/vcreate_test.v b/cmd/tools/vcreate_test.v
index 2b5b562cf8..b325adae1f 100644
--- a/cmd/tools/vcreate_test.v
+++ b/cmd/tools/vcreate_test.v
@@ -3,7 +3,7 @@ import os
 const test_path = 'vcreate_test'
 
 fn init_and_check() ? {
-	vexe := os.getenv('VEXE')
+	vexe := @VEXE
 	os.execute_or_panic('$vexe init')
 
 	assert os.read_file('vcreate_test.v') ? == [
@@ -53,12 +53,12 @@ fn test_v_init() ? {
 fn test_v_init_in_git_dir() ? {
 	dir := os.join_path(os.temp_dir(), test_path)
 	os.rmdir_all(dir) or {}
-	os.execute_or_panic('git init $dir')
+	os.mkdir(dir) ?
 	defer {
 		os.rmdir_all(dir) or {}
 	}
 	os.chdir(dir)
-
+	os.execute_or_panic('git init .')
 	init_and_check() ?
 }
 
@@ -72,7 +72,7 @@ fn test_v_init_no_overwrite_gitignore() ? {
 	}
 	os.chdir(dir)
 
-	vexe := os.getenv('VEXE')
+	vexe := @VEXE
 	os.execute_or_panic('$vexe init')
 
 	assert os.read_file('.gitignore') ? == 'blah'
diff --git a/cmd/tools/vdoc/tests/testdata/project1/main.out b/cmd/tools/vdoc/tests/testdata/project1/main.out
new file mode 100644
index 0000000000..a7b5091064
--- /dev/null
+++ b/cmd/tools/vdoc/tests/testdata/project1/main.out
@@ -0,0 +1,3 @@
+cmd/tools/vdoc/tests/testdata/project1/main.v:0:1: error: unexpected unknown, expecting `const`
+    1 | const (
+    2 |     source_root = 'temp'
diff --git a/cmd/tools/vdoc/tests/testdata/project1/main.v b/cmd/tools/vdoc/tests/testdata/project1/main.v
new file mode 100644
index 0000000000..1a1b52796e
--- /dev/null
+++ b/cmd/tools/vdoc/tests/testdata/project1/main.v
@@ -0,0 +1,8 @@
+const (
+	source_root = 'temp'
+)
+
+// funky - comment for function below
+fn funky() {
+	println('hi')
+}
diff --git a/cmd/tools/vdoc/tests/vdoc_file_test.v b/cmd/tools/vdoc/tests/vdoc_file_test.v
new file mode 100644
index 0000000000..49a0130389
--- /dev/null
+++ b/cmd/tools/vdoc/tests/vdoc_file_test.v
@@ -0,0 +1,72 @@
+import os
+import rand
+import term
+import v.util.vtest
+import v.util.diff
+
+const vexe = @VEXE
+
+const vroot = @VMODROOT
+
+const diff_cmd = find_diff_cmd()
+
+fn find_diff_cmd() string {
+	return diff.find_working_diff_command() or { '' }
+}
+
+fn test_vet() {
+	os.setenv('VCOLORS', 'never', true)
+	os.chdir(vroot)
+	test_dir := 'cmd/tools/vdoc/tests/testdata'
+	main_files := get_main_files_in_dir(test_dir)
+	fails := check_path(vexe, test_dir, main_files)
+	assert fails == 0
+}
+
+fn get_main_files_in_dir(dir string) []string {
+	mut mfiles := os.walk_ext(dir, '.v')
+	mfiles.sort()
+	return mfiles
+}
+
+fn check_path(vexe string, dir string, tests []string) int {
+	mut nb_fail := 0
+	paths := vtest.filter_vtest_only(tests, basepath: vroot)
+	for path in paths {
+		program := path
+		print(path + ' ')
+		res := os.execute('$vexe doc $program')
+		if res.exit_code < 0 {
+			panic(res.output)
+		}
+		mut expected := os.read_file(program.replace('main.v', 'main.out')) or { panic(err) }
+		expected = clean_line_endings(expected)
+		found := clean_line_endings(res.output)
+		if expected != found {
+			println(term.red('FAIL'))
+			println('============')
+			println('expected:')
+			println(expected)
+			println('============')
+			println('found:')
+			println(found)
+			println('============\n')
+			println('diff:')
+			println(diff.color_compare_strings(diff_cmd, rand.ulid(), found, expected))
+			println('============\n')
+			nb_fail++
+		} else {
+			println(term.green('OK'))
+		}
+	}
+	return nb_fail
+}
+
+fn clean_line_endings(s string) string {
+	mut res := s.trim_space()
+	res = res.replace(' \n', '\n')
+	res = res.replace(' \r\n', '\n')
+	res = res.replace('\r\n', '\n')
+	res = res.trim('\n')
+	return res
+}
diff --git a/cmd/tools/vfmt.v b/cmd/tools/vfmt.v
index c14854832b..2ba8956879 100644
--- a/cmd/tools/vfmt.v
+++ b/cmd/tools/vfmt.v
@@ -11,6 +11,7 @@ import v.ast
 import v.pref
 import v.fmt
 import v.util
+import v.util.diff
 import v.parser
 import vhelp
 
@@ -203,25 +204,25 @@ fn (foptions &FormatOptions) post_process_file(file string, formatted_file_path
 		return
 	}
 	if foptions.is_diff {
-		diff_cmd := util.find_working_diff_command() or {
+		diff_cmd := diff.find_working_diff_command() or {
 			eprintln(err)
 			return
 		}
 		if foptions.is_verbose {
 			eprintln('Using diff command: $diff_cmd')
 		}
-		diff := util.color_compare_files(diff_cmd, file, formatted_file_path)
+		diff := diff.color_compare_files(diff_cmd, file, formatted_file_path)
 		if diff.len > 0 {
 			println(diff)
 		}
 		return
 	}
 	if foptions.is_verify {
-		diff_cmd := util.find_working_diff_command() or {
+		diff_cmd := diff.find_working_diff_command() or {
 			eprintln(err)
 			return
 		}
-		x := util.color_compare_files(diff_cmd, file, formatted_file_path)
+		x := diff.color_compare_files(diff_cmd, file, formatted_file_path)
 		if x.len != 0 {
 			println("$file is not vfmt'ed")
 			return error('')
diff --git a/cmd/tools/vvet/vet_test.v b/cmd/tools/vvet/vet_test.v
index 9bb6443950..3291f20c7d 100644
--- a/cmd/tools/vvet/vet_test.v
+++ b/cmd/tools/vvet/vet_test.v
@@ -2,12 +2,12 @@ import os
 import rand
 import term
 import v.util.vtest
-import v.util
+import v.util.diff
 
 const diff_cmd = find_diff_cmd()
 
 fn find_diff_cmd() string {
-	res := util.find_working_diff_command() or { '' }
+	res := diff.find_working_diff_command() or { '' }
 	return res
 }
 
@@ -52,7 +52,7 @@ fn check_path(vexe string, dir string, tests []string) int {
 			println(found)
 			println('============\n')
 			println('diff:')
-			println(util.color_compare_strings(diff_cmd, rand.ulid(), found, expected))
+			println(diff.color_compare_strings(diff_cmd, rand.ulid(), found, expected))
 			println('============\n')
 			nb_fail++
 		} else {
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 69f4262e16..2f7a320269 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -7367,7 +7367,12 @@ fn (mut c Checker) fn_decl(mut node ast.FnDecl) {
 			}
 		}
 		// needed for proper error reporting during vweb route checking
-		sym.methods[node.method_idx].source_fn = voidptr(node)
+		if node.method_idx < sym.methods.len {
+			sym.methods[node.method_idx].source_fn = voidptr(node)
+		} else {
+			c.error('method index: $node.method_idx >= sym.methods.len: $sym.methods.len',
+				node.pos)
+		}
 	}
 	if node.language == .v {
 		// Make sure all types are valid
diff --git a/vlib/v/compiler_errors_test.v b/vlib/v/compiler_errors_test.v
index 5c6f7c4faa..e3e1b4156e 100644
--- a/vlib/v/compiler_errors_test.v
+++ b/vlib/v/compiler_errors_test.v
@@ -1,7 +1,7 @@
 import os
 import rand
 import term
-import v.util
+import v.util.diff
 import v.util.vtest
 import time
 import sync
@@ -314,9 +314,9 @@ fn clean_line_endings(s string) string {
 }
 
 fn diff_content(s1 string, s2 string) {
-	diff_cmd := util.find_working_diff_command() or { return }
+	diff_cmd := diff.find_working_diff_command() or { return }
 	println(term.bold(term.yellow('diff: ')))
-	println(util.color_compare_strings(diff_cmd, rand.ulid(), s1, s2))
+	println(diff.color_compare_strings(diff_cmd, rand.ulid(), s1, s2))
 	println('============\n')
 }
 
diff --git a/vlib/v/fmt/fmt_keep_test.v b/vlib/v/fmt/fmt_keep_test.v
index 32c64e2977..5f2af07191 100644
--- a/vlib/v/fmt/fmt_keep_test.v
+++ b/vlib/v/fmt/fmt_keep_test.v
@@ -8,7 +8,7 @@ import v.fmt
 import v.parser
 import v.ast
 import v.pref
-import v.util
+import v.util.diff
 import v.util.vtest
 
 const (
@@ -32,7 +32,7 @@ fn test_fmt() {
 	os.chdir(vroot)
 	basepath := os.join_path(vroot, '')
 	tmpfolder := os.temp_dir()
-	diff_cmd := util.find_working_diff_command() or { '' }
+	diff_cmd := diff.find_working_diff_command() or { '' }
 	mut fmt_bench := benchmark.new_benchmark()
 	keep_input_files := os.walk_ext('vlib/v/fmt/tests', '_keep.vv')
 	expected_input_files := os.walk_ext('vlib/v/fmt/tests', '_expected.vv')
@@ -70,7 +70,7 @@ fn test_fmt() {
 			}
 			vfmt_result_file := os.join_path(tmpfolder, 'vfmt_run_over_$ifilename')
 			os.write_file(vfmt_result_file, result_ocontent) or { panic(err.msg) }
-			eprintln(util.color_compare_files(diff_cmd, opath, vfmt_result_file))
+			eprintln(diff.color_compare_files(diff_cmd, opath, vfmt_result_file))
 			continue
 		}
 		fmt_bench.ok()
diff --git a/vlib/v/fmt/fmt_test.v b/vlib/v/fmt/fmt_test.v
index 06b33163c9..a1130c9b69 100644
--- a/vlib/v/fmt/fmt_test.v
+++ b/vlib/v/fmt/fmt_test.v
@@ -8,7 +8,7 @@ import v.ast
 import v.fmt
 import v.parser
 import v.pref
-import v.util
+import v.util.diff
 
 const (
 	error_missing_vexe = 1
@@ -28,7 +28,7 @@ fn test_fmt() {
 	}
 	vroot := os.dir(vexe)
 	tmpfolder := os.temp_dir()
-	diff_cmd := util.find_working_diff_command() or { '' }
+	diff_cmd := diff.find_working_diff_command() or { '' }
 	mut fmt_bench := benchmark.new_benchmark()
 	// Lookup the existing test _input.vv files:
 	input_files := os.walk_ext('$vroot/vlib/v/fmt/tests', '_input.vv')
@@ -62,7 +62,7 @@ fn test_fmt() {
 			}
 			vfmt_result_file := os.join_path(tmpfolder, 'vfmt_run_over_$ifilename')
 			os.write_file(vfmt_result_file, result_ocontent) or { panic(err) }
-			eprintln(util.color_compare_files(diff_cmd, opath, vfmt_result_file))
+			eprintln(diff.color_compare_files(diff_cmd, opath, vfmt_result_file))
 			continue
 		}
 		fmt_bench.ok()
diff --git a/vlib/v/fmt/fmt_vlib_test.v b/vlib/v/fmt/fmt_vlib_test.v
index 9fcf3904b4..9315ff8bbb 100644
--- a/vlib/v/fmt/fmt_vlib_test.v
+++ b/vlib/v/fmt/fmt_vlib_test.v
@@ -8,7 +8,7 @@ import v.ast
 import v.fmt
 import v.parser
 import v.pref
-import v.util
+import v.util.diff
 
 const (
 	error_missing_vexe = 1
@@ -31,7 +31,7 @@ fn test_vlib_fmt() {
 	}
 	vroot := os.dir(vexe)
 	tmpfolder := os.temp_dir()
-	diff_cmd := util.find_working_diff_command() or { '' }
+	diff_cmd := diff.find_working_diff_command() or { '' }
 	mut fmt_bench := benchmark.new_benchmark()
 	os.chdir(vroot)
 	input_files := os.walk_ext('vlib/v/', '.v').filter(!it.contains('/tests/'))
@@ -60,7 +60,7 @@ fn test_vlib_fmt() {
 			}
 			vfmt_result_file := os.join_path(tmpfolder, 'vfmt_run_over_$ifilename')
 			os.write_file(vfmt_result_file, result_ocontent) or { panic(err) }
-			eprintln(util.color_compare_files(diff_cmd, opath, vfmt_result_file))
+			eprintln(diff.color_compare_files(diff_cmd, opath, vfmt_result_file))
 			continue
 		}
 		fmt_bench.ok()
diff --git a/vlib/v/tests/inout/compiler_test.v b/vlib/v/tests/inout/compiler_test.v
index 1cd0f5f4a1..88178ce876 100644
--- a/vlib/v/tests/inout/compiler_test.v
+++ b/vlib/v/tests/inout/compiler_test.v
@@ -4,7 +4,7 @@
 import os
 import rand
 import term
-import v.util
+import v.util.diff
 import v.util.vtest
 
 const turn_off_vcolors = os.setenv('VCOLORS', 'never', true)
@@ -14,7 +14,7 @@ fn test_all() {
 	vexe := os.getenv('VEXE')
 	vroot := os.dir(vexe)
 	os.chdir(vroot)
-	diff_cmd := util.find_working_diff_command() or { '' }
+	diff_cmd := diff.find_working_diff_command() or { '' }
 	dir := 'vlib/v/tests/inout'
 	files := os.ls(dir) or { panic(err) }
 	tests := files.filter(it.ends_with('.vv'))
@@ -78,7 +78,7 @@ fn test_all() {
 			println(found)
 			if diff_cmd != '' {
 				println(term.header('difference:', '-'))
-				println(util.color_compare_strings(diff_cmd, rand.ulid(), expected, found))
+				println(diff.color_compare_strings(diff_cmd, rand.ulid(), expected, found))
 			} else {
 				println(term.h_divider('-'))
 			}
diff --git a/vlib/v/tests/repl/run.v b/vlib/v/tests/repl/run.v
deleted file mode 100644
index 498e432713..0000000000
--- a/vlib/v/tests/repl/run.v
+++ /dev/null
@@ -1,24 +0,0 @@
-module main
-
-import v.tests.repl.runner
-import log
-import benchmark
-
-fn main() {
-	mut logger := log.Log{}
-	logger.set_level(.debug)
-	options := runner.new_options()
-	mut bmark := benchmark.new_benchmark()
-	for file in options.files {
-		bmark.step()
-		fres := runner.run_repl_file(options.wd, options.vexec, file) or {
-			bmark.fail()
-			logger.error(bmark.step_message_fail(err.msg))
-			continue
-		}
-		bmark.ok()
-		logger.info(bmark.step_message_ok(fres))
-	}
-	bmark.stop()
-	logger.info(bmark.total_message('total time spent running REPL files'))
-}
diff --git a/vlib/v/tests/repl/runner/runner.v b/vlib/v/tests/repl/runner/runner.v
index 9259e28790..482d8d03c6 100644
--- a/vlib/v/tests/repl/runner/runner.v
+++ b/vlib/v/tests/repl/runner/runner.v
@@ -1,7 +1,7 @@
 module runner
 
 import os
-import v.util
+import v.util.diff
 
 pub struct RunnerOptions {
 pub:
@@ -35,8 +35,8 @@ pub fn full_path_to_v(dirs_in int) string {
 }
 
 fn diff_files(file_result string, file_expected string) string {
-	diffcmd := util.find_working_diff_command() or { return err }
-	return util.color_compare_files(diffcmd, file_result, file_expected)
+	diffcmd := diff.find_working_diff_command() or { return err }
+	return diff.color_compare_files(diffcmd, file_result, file_expected)
 }
 
 pub fn run_repl_file(wd string, vexec string, file string) ?string {
diff --git a/vlib/v/util/diff.v b/vlib/v/util/diff.v
index d28ac3f48d..3e1814e9f0 100644
--- a/vlib/v/util/diff.v
+++ b/vlib/v/util/diff.v
@@ -1,85 +1,17 @@
 module util
 
-import os
-import time
+import v.util.diff
 
 // iterates through a list of known diff cli commands
 // and returns it with basic options
 pub fn find_working_diff_command() ?string {
-	env_difftool := os.getenv('VDIFF_TOOL')
-	env_diffopts := os.getenv('VDIFF_OPTIONS')
-	if env_difftool != '' {
-		return '$env_difftool $env_diffopts'
-	}
-	mut known_diff_tools := []string{}
-	if env_difftool.len > 0 {
-		known_diff_tools << env_difftool
-	}
-	known_diff_tools << ['colordiff', 'gdiff', 'diff', 'colordiff.exe', 'diff.exe', 'opendiff',
-		'code', 'code.cmd']
-	// NOTE: code.cmd is the Windows variant of the `code` cli tool
-	for diffcmd in known_diff_tools {
-		if diffcmd == 'opendiff' { // opendiff has no `--version` option
-			if opendiff_exists() {
-				return diffcmd
-			}
-			continue
-		}
-		p := os.execute('$diffcmd --version')
-		if p.exit_code < 0 {
-			continue
-		}
-		if p.exit_code == 127 && diffcmd == env_difftool {
-			// user setup is wonky, fix it
-			return error('could not find specified VDIFF_TOOL $diffcmd')
-		}
-		if p.exit_code == 0 { // success
-			if diffcmd in ['code', 'code.cmd'] {
-				// there is no guarantee that the env opts exist
-				// or include `-d`, so (harmlessly) add it
-				return '$diffcmd $env_diffopts -d'
-			}
-			return '$diffcmd $env_diffopts'
-		}
-	}
-	return error('No working "diff" command found')
-}
-
-// determine if the FileMerge opendiff tool is available
-fn opendiff_exists() bool {
-	o := os.execute('opendiff')
-	if o.exit_code < 0 {
-		return false
-	}
-	if o.exit_code == 1 { // failed (expected), but found (i.e. not 127)
-		if o.output.contains('too few arguments') { // got some expected output
-			return true
-		}
-	}
-	return false
+	return diff.find_working_diff_command()
 }
 
 pub fn color_compare_files(diff_cmd string, file1 string, file2 string) string {
-	if diff_cmd != '' {
-		full_cmd := '$diff_cmd --minimal --text --unified=2  --show-function-line="fn " "$file1" "$file2" '
-		x := os.execute(full_cmd)
-		if x.exit_code < 0 {
-			return 'comparison command: `$full_cmd` not found'
-		}
-		return x.output.trim_right('\r\n')
-	}
-	return ''
+	return diff.color_compare_files(diff_cmd, file1, file2)
 }
 
 pub fn color_compare_strings(diff_cmd string, unique_prefix string, expected string, found string) string {
-	cdir := os.join_path(os.cache_dir(), unique_prefix)
-	os.mkdir(cdir) or {}
-	ctime := time.sys_mono_now()
-	e_file := os.join_path(cdir, '${ctime}.expected.txt')
-	f_file := os.join_path(cdir, '${ctime}.found.txt')
-	os.write_file(e_file, expected) or { panic(err) }
-	os.write_file(f_file, found) or { panic(err) }
-	res := color_compare_files(diff_cmd, e_file, f_file)
-	os.rmdir_all(cdir) or {}
-	return res
+	return diff.color_compare_strings(diff_cmd, unique_prefix, expected, found)
 }
diff --git a/vlib/v/util/diff/diff.v b/vlib/v/util/diff/diff.v
new file mode 100644
index 0000000000..490342a07c
--- /dev/null
+++ b/vlib/v/util/diff/diff.v
@@ -0,0 +1,85 @@
+module diff
+
+import os
+import time
+
+// iterates through a list of known diff cli commands
+// and returns it with basic options
+pub fn find_working_diff_command() ?string {
+	env_difftool := os.getenv('VDIFF_TOOL')
+	env_diffopts := os.getenv('VDIFF_OPTIONS')
+	if env_difftool != '' {
+		return '$env_difftool $env_diffopts'
+	}
+	mut known_diff_tools := []string{}
+	if env_difftool.len > 0 {
+		known_diff_tools << env_difftool
+	}
+	known_diff_tools << ['colordiff', 'gdiff', 'diff', 'colordiff.exe', 'diff.exe', 'opendiff',
+		'code', 'code.cmd']
+	// NOTE: code.cmd is the Windows variant of the `code` cli tool
+	for diffcmd in known_diff_tools {
+		if diffcmd == 'opendiff' { // opendiff has no `--version` option
+			if opendiff_exists() {
+				return diffcmd
+			}
+			continue
+		}
+		p := os.execute('$diffcmd --version')
+		if p.exit_code < 0 {
+			continue
+		}
+		if p.exit_code == 127 && diffcmd == env_difftool {
+			// user setup is wonky, fix it
+			return error('could not find specified VDIFF_TOOL $diffcmd')
+		}
+		if p.exit_code == 0 { // success
+			if diffcmd in ['code', 'code.cmd'] {
+				// there is no guarantee that the env opts exist
+				// or include `-d`, so (harmlessly) add it
+				return '$diffcmd $env_diffopts -d'
+			}
+			return '$diffcmd $env_diffopts'
+		}
+	}
+	return error('No working "diff" command found')
+}
+
+// determine if the FileMerge opendiff tool is available
+fn opendiff_exists() bool {
+	o := os.execute('opendiff')
+	if o.exit_code < 0 {
+		return false
+	}
+	if o.exit_code == 1 { // failed (expected), but found (i.e. not 127)
+		if o.output.contains('too few arguments') { // got some expected output
+			return true
+		}
+	}
+	return false
+}
+
+pub fn color_compare_files(diff_cmd string, file1 string, file2 string) string {
+	if diff_cmd != '' {
+		full_cmd := '$diff_cmd --minimal --text --unified=2  --show-function-line="fn " "$file1" "$file2" '
+		x := os.execute(full_cmd)
+		if x.exit_code < 0 {
+			return 'comparison command: `$full_cmd` not found'
+		}
+		return x.output.trim_right('\r\n')
+	}
+	return ''
+}
+
+pub fn color_compare_strings(diff_cmd string, unique_prefix string, expected string, found string) string {
+	cdir := os.join_path(os.cache_dir(), unique_prefix)
+	os.mkdir(cdir) or {}
+	ctime := time.sys_mono_now()
+	e_file := os.join_path(cdir, '${ctime}.expected.txt')
+	f_file := os.join_path(cdir, '${ctime}.found.txt')
+	os.write_file(e_file, expected) or { panic(err) }
+	os.write_file(f_file, found) or { panic(err) }
+	res := color_compare_files(diff_cmd, e_file, f_file)
+	os.rmdir_all(cdir) or {}
+	return res
+}