diff --git a/TESTS.md b/TESTS.md
index 0ba073a5ba..b0a4120cab 100644
--- a/TESTS.md
+++ b/TESTS.md
@@ -23,6 +23,11 @@ General runnable tests for different features of the V compiler.
 Test output of running a V program matches an expected .out file.
 Check the source for how to test panics.
 
+* `vlib/v/tests/run_project_folders_test.v`
+Tests whether whole project folders can be compiled, and run.
+NB: Each project in these folders, should finish with exit code 0,
+and it should output `OK` as its last stdout line.
+
 ## Test building of actual V programs (examples, tools, V itself)
 
 * `v build-tools`
diff --git a/vlib/v/parser/fn.v b/vlib/v/parser/fn.v
index 5757640792..6c028a3ee3 100644
--- a/vlib/v/parser/fn.v
+++ b/vlib/v/parser/fn.v
@@ -653,7 +653,7 @@ fn (mut p Parser) anon_fn() ast.AnonFn {
 		is_variadic: is_variadic
 		return_type: return_type
 	}
-	name := 'anon_fn_${p.table.fn_type_signature(func)}_$p.tok.pos'
+	name := 'anon_fn_${p.unique_prefix}_${p.table.fn_type_signature(func)}_$p.tok.pos'
 	keep_fn_name := p.cur_fn_name
 	p.cur_fn_name = name
 	if p.tok.kind == .lcbr {
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index b923cd8e22..0b8353a9a6 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -11,6 +11,7 @@ import v.util
 import v.vet
 import v.errors
 import os
+import hash
 
 const (
 	builtin_functions = ['print', 'println', 'eprint', 'eprintln', 'isnil', 'panic', 'exit']
@@ -22,6 +23,7 @@ mut:
 	file_base         string       // "hello.v"
 	file_name         string       // "/home/user/hello.v"
 	file_name_dir     string       // "/home/user"
+	unique_prefix     string       // a hash of p.file_name, used for making anon fn generation unique
 	file_backend_mode ast.Language // .c for .c.v|.c.vv|.c.vsh files; .js for .js.v files, .amd64/.rv32/other arches for .amd64.v/.rv32.v/etc. files, .v otherwise.
 	scanner           &scanner.Scanner
 	comments_mode     scanner.CommentsMode = .skip_comments
@@ -141,6 +143,7 @@ pub fn (mut p Parser) set_path(path string) {
 	p.file_name = path
 	p.file_base = os.base(path)
 	p.file_name_dir = os.dir(path)
+	p.unique_prefix = hash.sum64_string(p.file_name, 13).hex_full()
 	if p.file_base.ends_with('_test.v') || p.file_base.ends_with('_test.vv') {
 		p.inside_test_file = true
 	}
diff --git a/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v b/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v
new file mode 100644
index 0000000000..9bd4150f3e
--- /dev/null
+++ b/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v
@@ -0,0 +1,8 @@
+module main
+
+fn a() int {
+	f := fn (i int) int {
+		return i
+	}
+	return f(1)
+}
diff --git a/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v b/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v
new file mode 100644
index 0000000000..fd97e4220b
--- /dev/null
+++ b/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v
@@ -0,0 +1,14 @@
+module main
+
+fn b() int {
+	f := fn (i int) int {
+		return i
+	}
+	return f(1)
+}
+
+fn main() {
+	println(a())
+	println(b())
+	println('OK')
+}
diff --git a/vlib/v/tests/run_project_folders_test.v b/vlib/v/tests/run_project_folders_test.v
new file mode 100644
index 0000000000..089d18354e
--- /dev/null
+++ b/vlib/v/tests/run_project_folders_test.v
@@ -0,0 +1,36 @@
+import os
+import term
+
+const vexe = os.getenv('VEXE')
+
+const vroot = os.dir(vexe)
+
+fn test_vexe_exists() {
+	assert vexe.len > 0
+	assert os.is_file(vexe)
+}
+
+fn test_v_profile_works() ? {
+	os.chdir(vroot)
+	folders_root := os.join_path(vroot, 'vlib/v/tests/run_project_folders')
+	folder_names := os.ls(folders_root) ?
+	mut folder_paths := []string{}
+	for fname in folder_names {
+		folder_path := os.join_path(folders_root, fname)
+		if os.is_dir(folder_path) {
+			folder_paths << folder_path
+		}
+	}
+	for folder_path in folder_paths {
+		local_path := folder_path.replace(vroot + os.path_separator, '').replace('\\',
+			'/')
+		println('..... $local_path/')
+		res := os.execute('"$vexe" run $folder_path')
+		// eprintln('res: $res')
+		assert res.exit_code == 0
+		assert res.output.len > 0
+		assert res.output.contains('OK')
+		term.clear_previous_line()
+		println('${term.bold('OK')}    $local_path/')
+	}
+}