diff --git a/vlib/compiler/tests/array_to_string_test.v b/vlib/compiler/tests/array_to_string_test.v
new file mode 100644
index 0000000000..08e1001d18
--- /dev/null
+++ b/vlib/compiler/tests/array_to_string_test.v
@@ -0,0 +1,5 @@
+fn test_array_to_string_conversion() {
+  expected := '["1", "2", "3", "4"] '
+  arr := ['1', '2', '3', '4']
+  assert '$arr' == expected
+}
diff --git a/vlib/compiler/tests/repl/arr_decl.repl b/vlib/compiler/tests/repl/arr_decl.repl
deleted file mode 100644
index 1e7472a04a..0000000000
--- a/vlib/compiler/tests/repl/arr_decl.repl
+++ /dev/null
@@ -1,4 +0,0 @@
-arr := ['1', '2', '3', '4']
-println(arr)
-===output===
-["1", "2", "3", "4"]
diff --git a/vlib/compiler/tests/repl/chained_fields.correct.repl b/vlib/compiler/tests/repl/chained_fields.correct.repl
deleted file mode 100644
index 81597218c6..0000000000
--- a/vlib/compiler/tests/repl/chained_fields.correct.repl
+++ /dev/null
@@ -1,16 +0,0 @@
-struct A { mut: v int } struct B {      a A } struct C { mut: b B }  struct D { mut: c C } struct E { mut: v []int } struct F { e []E }
-
-mut b := B{} b = B{A{2}} 
-println('b is: ' + b.a.v.str())
-
-mut c := C{} c.b = B{}
-
-mut d := D{} d.c.b = B{}
-
-f := F{[E{[10,20,30]},E{[100,200,300,400]}]}
-println('f.e[0].v.len: ${f.e[0].v.len}')
-println('f.e[1].v.len: ${f.e[1].v.len}')
-===output===
-b is: 2
-f.e[0].v.len: 3
-f.e[1].v.len: 4
diff --git a/vlib/compiler/tests/repl/chained_fields.repl b/vlib/compiler/tests/repl/chained_fields.repl
deleted file mode 100644
index e62ead43e2..0000000000
--- a/vlib/compiler/tests/repl/chained_fields.repl
+++ /dev/null
@@ -1,78 +0,0 @@
-/*  1 */ struct A { mut: v int }
-/*  2 */ struct B {      a A }
-/*  3 */ struct C { mut: b B }
-/*  4 */ struct D { mut: c C }
-
-/*  5 */ struct E { mut: v []int }
-/*  6 */ struct F {      e []E }
-
-/*  7 */ mut s := 'hello world'
-/*( 8)*/ s.len = 0   // Error (field len immutable)
-
-/*  8 */ mut b := B{}
-/*( 9)*/ b.a.v = 1   // Error (field a immutable)
-/*( 9)*/ b.a = A{}   // Error (field a immutable)
-/*  9 */ b = B{A{2}} // Correct
-
-/* 10 */ mut c := C{}
-/* 11 */ c.b = B{}   // Correct
-/*(12)*/ c.b.a = A{} // Error (field a immutable)
-/*(12)*/ c.b.a.v = 1 // Error (field a immutable)
-
-/* 12 */ c2 := C{}
-/*(13)*/ c2.b = B{}  // Error (c2 immutable)
-/* 13 */ mut d := D{}
-/* 14 */ d.c.b = B{} // Correct
-
-/* 15 */ mut f := F{}
-/*(16)*/ f.e << E{}      // Error (field e immutable)
-/*(16)*/ f.e[0].v << 1   // Error (field e immutable)
-
-/* 16 */ e := E{}
-/*(17)*/ e.v << 1    // Error (e immutable)
-
-===output===
-cannot modify immutable field `len` (type `string`)
-declare the field with `mut:`
-struct string {
-mut:
-	len int
-}
-cannot modify immutable field `a` (type `B`)
-declare the field with `mut:`
-struct B {
-mut:
-	a A
-}
-cannot modify immutable field `a` (type `B`)
-declare the field with `mut:`
-struct B {
-mut:
-	a A
-}
-cannot modify immutable field `a` (type `B`)
-declare the field with `mut:`
-struct B {
-mut:
-	a A
-}
-cannot modify immutable field `a` (type `B`)
-declare the field with `mut:`
-struct B {
-mut:
-	a A
-}
-`c2` is immutable
-cannot modify immutable field `e` (type `F`)
-declare the field with `mut:`
-struct F {
-mut:
-	e []E
-}
-cannot modify immutable field `e` (type `F`)
-declare the field with `mut:`
-struct F {
-mut:
-	e []E
-}
-`e` is immutable (can't <<)
diff --git a/vlib/compiler/tests/repl/chained_fields/bd.repl b/vlib/compiler/tests/repl/chained_fields/bd.repl
new file mode 100644
index 0000000000..75cc56b917
--- /dev/null
+++ b/vlib/compiler/tests/repl/chained_fields/bd.repl
@@ -0,0 +1,17 @@
+struct A { mut: v int }  struct B { a A }  struct C { mut: b B } struct D { mut: c C }
+mut b := B{} b = B{A{2}}
+b.a.v = 1   // Error (field a immutable)
+b.a = A{}   // Error (field a immutable)
+===output===
+cannot modify immutable field `a` (type `B`)
+declare the field with `mut:`
+struct B {
+mut:
+	a A
+}
+cannot modify immutable field `a` (type `B`)
+declare the field with `mut:`
+struct B {
+mut:
+	a A
+}
diff --git a/vlib/compiler/tests/repl/chained_fields/c.repl b/vlib/compiler/tests/repl/chained_fields/c.repl
new file mode 100644
index 0000000000..1919ff6f58
--- /dev/null
+++ b/vlib/compiler/tests/repl/chained_fields/c.repl
@@ -0,0 +1,17 @@
+struct A { mut: v int }  struct B { a A }  struct C { mut: b B } struct D { mut: c C } 
+mut c := C{} c.b = B{}
+c.b.a = A{} // Error (field a immutable)
+c.b.a.v = 1 // Error (field a immutable)
+===output===
+cannot modify immutable field `a` (type `B`)
+declare the field with `mut:`
+struct B {
+mut:
+	a A
+}
+cannot modify immutable field `a` (type `B`)
+declare the field with `mut:`
+struct B {
+mut:
+	a A
+}
diff --git a/vlib/compiler/tests/repl/chained_fields/c2.repl b/vlib/compiler/tests/repl/chained_fields/c2.repl
new file mode 100644
index 0000000000..1c477a589b
--- /dev/null
+++ b/vlib/compiler/tests/repl/chained_fields/c2.repl
@@ -0,0 +1,5 @@
+struct A { mut: v int }  struct B { a A }  struct C { mut: b B } struct D { mut: c C } 
+c2 := C{}
+c2.b = B{}  // Error (c2 immutable)
+===output===
+`c2` is immutable
diff --git a/vlib/compiler/tests/repl/chained_fields/d.repl b/vlib/compiler/tests/repl/chained_fields/d.repl
new file mode 100644
index 0000000000..af7986ae18
--- /dev/null
+++ b/vlib/compiler/tests/repl/chained_fields/d.repl
@@ -0,0 +1,5 @@
+struct A { mut: v int }  struct B { a A }  struct C { mut: b B } struct D { mut: c C }
+mut d := D{} d.c.b = B{}
+'OK'
+===output===
+OK
diff --git a/vlib/compiler/tests/repl/chained_fields/ef.repl b/vlib/compiler/tests/repl/chained_fields/ef.repl
new file mode 100644
index 0000000000..509218bf90
--- /dev/null
+++ b/vlib/compiler/tests/repl/chained_fields/ef.repl
@@ -0,0 +1,19 @@
+struct E { mut: v []int } struct F { e []E } mut f := F{}
+f.e << E{}      // Error (field e immutable)
+f.e[0].v << 1   // Error (field e immutable)
+e := E{}
+e.v << 1    // Error (e immutable)
+===output===
+cannot modify immutable field `e` (type `F`)
+declare the field with `mut:`
+struct F {
+mut:
+	e []E
+}
+cannot modify immutable field `e` (type `F`)
+declare the field with `mut:`
+struct F {
+mut:
+	e []E
+}
+`e` is immutable (can't <<)
diff --git a/vlib/compiler/tests/repl/conditional_blocks.repl b/vlib/compiler/tests/repl/conditional_blocks.repl
deleted file mode 100644
index ca10025c37..0000000000
--- a/vlib/compiler/tests/repl/conditional_blocks.repl
+++ /dev/null
@@ -1,18 +0,0 @@
-if true {
-  println('foo')
-}
-for i := 0; i < 4; i++ {
-  println(i)
-}
-if false {
-  println('foo')
-} else {
-  println('bar')
-}
-===output===
-foo
-0
-1
-2
-3
-bar
diff --git a/vlib/compiler/tests/repl/conditional_blocks/for.repl b/vlib/compiler/tests/repl/conditional_blocks/for.repl
new file mode 100644
index 0000000000..2f3f50cba6
--- /dev/null
+++ b/vlib/compiler/tests/repl/conditional_blocks/for.repl
@@ -0,0 +1,8 @@
+for i := 0; i < 4; i++ {
+  println(i)
+}
+===output===
+0
+1
+2
+3
diff --git a/vlib/compiler/tests/repl/conditional_blocks/if.repl b/vlib/compiler/tests/repl/conditional_blocks/if.repl
new file mode 100644
index 0000000000..9b3b2d6c5e
--- /dev/null
+++ b/vlib/compiler/tests/repl/conditional_blocks/if.repl
@@ -0,0 +1,5 @@
+if true {
+  println('foo')
+}
+===output===
+foo
diff --git a/vlib/compiler/tests/repl/conditional_blocks/if_else.repl b/vlib/compiler/tests/repl/conditional_blocks/if_else.repl
new file mode 100644
index 0000000000..b44b66eed3
--- /dev/null
+++ b/vlib/compiler/tests/repl/conditional_blocks/if_else.repl
@@ -0,0 +1,7 @@
+if false {
+  println('foo')
+} else {
+  println('bar')
+}
+===output===
+bar
diff --git a/vlib/compiler/tests/repl/default_printing.repl b/vlib/compiler/tests/repl/default_printing.repl
index b1de4b4f5b..5b03a57b99 100644
--- a/vlib/compiler/tests/repl/default_printing.repl
+++ b/vlib/compiler/tests/repl/default_printing.repl
@@ -1,5 +1,4 @@
-num := 1
-string := 'Hello'
+num := 1 string := 'Hello'
 num
 string
 ===output===
diff --git a/vlib/compiler/tests/repl/function.repl b/vlib/compiler/tests/repl/function.repl
index 0b20fa1a4e..25c0b9d887 100644
--- a/vlib/compiler/tests/repl/function.repl
+++ b/vlib/compiler/tests/repl/function.repl
@@ -1,11 +1,4 @@
-fn test() {
-  println('foo')
-}
-test()
-fn test2(a int) {
-  println(a)
-}
-test2(42)
+fn test() { println('foo') } test() fn test2(a int) {  println(a) } test2(42)
 ===output===
 foo
 42
diff --git a/vlib/compiler/tests/repl/immutable_len_fields.repl b/vlib/compiler/tests/repl/immutable_len_fields.repl
deleted file mode 100644
index 120eb7edcd..0000000000
--- a/vlib/compiler/tests/repl/immutable_len_fields.repl
+++ /dev/null
@@ -1,30 +0,0 @@
-mut s := 'hello world'
-s.len = 0   // Error (field len immutable)
-
-mut a := []string
-a.len = 0   // Error (field len immutable)
-
-mut ints := []int
-ints.len = 0   // Error (field len immutable)
-
-println('BYE')
-===output===
-cannot modify immutable field `len` (type `string`)
-declare the field with `mut:`
-struct string {
-mut:
-	len int
-}
-cannot modify immutable field `len` (type `array`)
-declare the field with `mut:`
-struct array {
-mut:
-	len int
-}
-cannot modify immutable field `len` (type `array`)
-declare the field with `mut:`
-struct array {
-mut:
-	len int
-}
-BYE
diff --git a/vlib/compiler/tests/repl/immutable_len_fields/fields.1.repl b/vlib/compiler/tests/repl/immutable_len_fields/fields.1.repl
new file mode 100644
index 0000000000..6186c4c826
--- /dev/null
+++ b/vlib/compiler/tests/repl/immutable_len_fields/fields.1.repl
@@ -0,0 +1,11 @@
+mut s := 'hello world'
+s.len = 0   // Error (field len immutable)
+'BYE'
+===output===
+cannot modify immutable field `len` (type `string`)
+declare the field with `mut:`
+struct string {
+mut:
+	len int
+}
+BYE
diff --git a/vlib/compiler/tests/repl/immutable_len_fields/fields.2.repl b/vlib/compiler/tests/repl/immutable_len_fields/fields.2.repl
new file mode 100644
index 0000000000..60e3929703
--- /dev/null
+++ b/vlib/compiler/tests/repl/immutable_len_fields/fields.2.repl
@@ -0,0 +1,11 @@
+mut a := []string
+a.len = 0   // Error (field len immutable)
+'BYE'
+===output===
+cannot modify immutable field `len` (type `array`)
+declare the field with `mut:`
+struct array {
+mut:
+	len int
+}
+BYE
diff --git a/vlib/compiler/tests/repl/immutable_len_fields/fields.3.repl b/vlib/compiler/tests/repl/immutable_len_fields/fields.3.repl
new file mode 100644
index 0000000000..41061ed354
--- /dev/null
+++ b/vlib/compiler/tests/repl/immutable_len_fields/fields.3.repl
@@ -0,0 +1,11 @@
+mut ints := []int
+ints.len = 0   // Error (field len immutable)
+println('BYE')
+===output===
+cannot modify immutable field `len` (type `array`)
+declare the field with `mut:`
+struct array {
+mut:
+	len int
+}
+BYE
diff --git a/vlib/compiler/tests/repl/interpolation.repl b/vlib/compiler/tests/repl/interpolation.repl
deleted file mode 100644
index c699b4d866..0000000000
--- a/vlib/compiler/tests/repl/interpolation.repl
+++ /dev/null
@@ -1,5 +0,0 @@
-a := 'Hello'
-b := 'World'
-println('$a $b')
-===output===
-Hello World
diff --git a/vlib/compiler/tests/repl/multiple_decl.repl b/vlib/compiler/tests/repl/multiple_decl.repl
index b7702fde71..e7b2ba8ebd 100644
--- a/vlib/compiler/tests/repl/multiple_decl.repl
+++ b/vlib/compiler/tests/repl/multiple_decl.repl
@@ -1,6 +1,4 @@
-name := 'Bob' 
-age := 20
-large_number := i64(9999999999)
+name := 'Bob' age := 20 large_number := i64(9999999999)
 println(name)
 println(age)
 println(large_number)
diff --git a/vlib/compiler/tests/repl/naked_strings.repl b/vlib/compiler/tests/repl/naked_strings.repl
index ba6fc474c7..3769ccc964 100644
--- a/vlib/compiler/tests/repl/naked_strings.repl
+++ b/vlib/compiler/tests/repl/naked_strings.repl
@@ -1,9 +1,5 @@
 'abc'
 'abc'+'xyz'
-'{'
-'}'
 ===output===
 abc
 abcxyz
-{
-}
diff --git a/vlib/compiler/tests/repl/newlines.repl b/vlib/compiler/tests/repl/newlines.repl
index 9f00e0b5e3..23304fa161 100644
--- a/vlib/compiler/tests/repl/newlines.repl
+++ b/vlib/compiler/tests/repl/newlines.repl
@@ -1,5 +1,3 @@
 
 
-
-
 ===output===
diff --git a/vlib/compiler/tests/repl/open_close_string_check.repl b/vlib/compiler/tests/repl/open_close_string_check.repl
new file mode 100644
index 0000000000..00aabe3009
--- /dev/null
+++ b/vlib/compiler/tests/repl/open_close_string_check.repl
@@ -0,0 +1,5 @@
+'{'
+'}'
+===output===
+{
+}
diff --git a/vlib/compiler/tests/repl/option.repl b/vlib/compiler/tests/repl/option.repl
index 84ed92976d..dbd223f449 100644
--- a/vlib/compiler/tests/repl/option.repl
+++ b/vlib/compiler/tests/repl/option.repl
@@ -1,7 +1,4 @@
-fn foo() ?bool {
-	return true
-}	
-
+fn foo() ?bool {return true}	
 fn main() {
 	foo()? // only works in main()
 	println('done')
diff --git a/vlib/compiler/tests/repl/postfix_operators.repl b/vlib/compiler/tests/repl/postfix_operators.repl
index 92b4db9fd6..68066f5594 100644
--- a/vlib/compiler/tests/repl/postfix_operators.repl
+++ b/vlib/compiler/tests/repl/postfix_operators.repl
@@ -1,11 +1,4 @@
-mut a := 2
-a++
-a
-println(a)
-println(a++)
+mut a := 10 a++ a++ a++ a--
 a
 ===output===
-3
-3
-3
-3
+12
diff --git a/vlib/compiler/tests/repl/repl_test.v b/vlib/compiler/tests/repl/repl_test.v
index 107f7ff83c..78f5ec2d9d 100644
--- a/vlib/compiler/tests/repl/repl_test.v
+++ b/vlib/compiler/tests/repl/repl_test.v
@@ -8,7 +8,7 @@ import sync
 import filepath
 
 fn test_the_v_compiler_can_be_invoked() {
-	vexec := runner.full_path_to_v(5)
+	vexec := runner.full_path_to_v(5)	
 	println('vexecutable: $vexec')
 	assert vexec != ''
 	vcmd := '"$vexec" --version'
@@ -43,28 +43,28 @@ fn test_all_v_repl_files() {
 		ntask_mtx: sync.new_mutex()
 		waitgroup: sync.new_waitgroup()
 	}
-
 	// warmup, and ensure that the vrepl is compiled in single threaded mode if it does not exist
 	runner.run_repl_file(os.cachedir(), session.options.vexec, 'vlib/compiler/tests/repl/nothing.repl') or {
 		panic(err)
 	}
 
 	session.bmark.set_total_expected_steps( session.options.files.len )
-	mut ncpus := runtime.nr_cpus()
+	mut ncpus := 0
+	ncpus = runtime.nr_cpus()
 	$if windows {
 	// See: https://docs.microsoft.com/en-us/cpp/build/reference/fs-force-synchronous-pdb-writes?view=vs-2019
 		ncpus = 1
 	}
 	session.waitgroup.add( ncpus )
 	for i:=0; i < ncpus; i++ {
-		go process_in_thread(session)
+		go process_in_thread(session,i)
 	}
 	session.waitgroup.wait()
 	session.bmark.stop()
 	println(session.bmark.total_message('total time spent running REPL files'))
 }
 
-fn process_in_thread( session mut Session ){
+fn process_in_thread( session mut Session, thread_id int ){
 	cdir := os.cachedir()
 	mut tls_bench := benchmark.new_benchmark()
 	tls_bench.set_total_expected_steps( session.bmark.nexpected_steps )
@@ -83,7 +83,7 @@ fn process_in_thread( session mut Session ){
 		}
 		os.mkdir( tfolder ) or { panic(err) }
 		
-		file := os.realpath( filepath.join( session.options.wd, session.options.files[ idx ] ) )
+		file := session.options.files[ idx ] 
 		session.bmark.step()
 		tls_bench.step()
 		fres := runner.run_repl_file(tfolder, session.options.vexec, file) or {
diff --git a/vlib/compiler/tests/repl/runner/runner.v b/vlib/compiler/tests/repl/runner/runner.v
index 7962a7d9c4..0818105c97 100644
--- a/vlib/compiler/tests/repl/runner/runner.v
+++ b/vlib/compiler/tests/repl/runner/runner.v
@@ -46,17 +46,18 @@ fn find_working_diff_command() ?string {
 
 fn diff_files( file_result, file_expected string ) string {
 	diffcmd := find_working_diff_command() or { return err }
-	diff := os.exec('$diffcmd   --minimal  --text   --unified=2  $file_result  $file_expected') or { return 'found diff command "$diffcmd" does not work' }
+	diff := os.exec('$diffcmd   --minimal  --text   --unified=2  ${file_result}  ${file_expected}') or { return 'found diff command "$diffcmd" does not work' }
 	return diff.output
 }
 
 pub fn run_repl_file(wd string, vexec string, file string) ?string {
-	fcontent := os.read_file(file) or {	return error('Could not read file $file') }
+	fcontent := os.read_file(file) or {	return error('Could not read file ${file}') }
 	content := fcontent.replace('\r', '')		
 	input := content.all_before('===output===\n')
 	output := content.all_after('===output===\n')
 
 	fname := filepath.filename( file )
+
 	input_temporary_filename := os.realpath(filepath.join( wd, 'input_temporary_filename.txt'))
 	os.write_file(input_temporary_filename, input)
 	os.write_file(  os.realpath(filepath.join( wd, 'original.txt' ) ), fcontent )
@@ -80,7 +81,7 @@ pub fn run_repl_file(wd string, vexec string, file string) ?string {
 		os.write_file( file_result, result )
 		os.write_file( file_expected, output )
 		diff := diff_files( file_result, file_expected )
-		return error('Difference found in REPL file: $file
+		return error('Difference found in REPL file: ${file}
 ====> Got      :
 |$result|
 ====> Expected :
@@ -89,16 +90,16 @@ pub fn run_repl_file(wd string, vexec string, file string) ?string {
 $diff
 		')
 	} else {
-		return 'Repl file $file is OK'
+		return 'Repl file ${file} is OK'
 	}
 }
 
 pub fn run_prod_file(wd string, vexec string, file string) ?string {
 	file_expected := '${file}.expected.txt'
-	f_expected_content := os.read_file(file_expected) or { return error('Could not read file $file') }
+	f_expected_content := os.read_file(file_expected) or { return error('Could not read file ${file}') }
 	expected_content := f_expected_content.replace('\r', '')		
 
-	cmd := '"$vexec" -prod run "$file"'
+	cmd := '"$vexec" -prod run "${file}"'
 	r := os.exec(cmd) or {
 		return error('Could not execute: $cmd')
 	}
@@ -113,7 +114,7 @@ pub fn run_prod_file(wd string, vexec string, file string) ?string {
 		file_result   := '${file}.result.txt'
 		os.write_file( file_result, result )
 		diff := diff_files( file_result, file_expected )
-		return error('Difference found in test: $file
+		return error('Difference found in test: ${file}
 ====> Got      :
 |$result|
 ====> Expected :
@@ -122,17 +123,19 @@ pub fn run_prod_file(wd string, vexec string, file string) ?string {
 $diff
 		')
 	} else {
-		return 'Prod file $file is OK'
+		return 'Prod file ${file} is OK'
 	}
 }
 
 pub fn new_options() RunnerOptions {
-	wd := os.getwd()
 	vexec := full_path_to_v(5)
+	mut wd := os.getwd()
 	mut files := []string
 	if os.args.len > 1 {
 		files = os.args[1..]
 	} else {
+		os.chdir( filepath.dir(vexec) )
+		wd = os.getwd()
 		files = os.walk_ext('.', '.repl')
 	}
 	return RunnerOptions {
diff --git a/vlib/compiler/tests/string_interpolation_test.v b/vlib/compiler/tests/string_interpolation_test.v
index d939d244dd..280c5d0045 100644
--- a/vlib/compiler/tests/string_interpolation_test.v
+++ b/vlib/compiler/tests/string_interpolation_test.v
@@ -1,4 +1,11 @@
 
+fn test_simple_string_interpolation(){
+	a := 'Hello'
+	b := 'World'
+	res := '$a $b'
+	assert res == 'Hello World'
+}
+
 fn test_excape_dollar_in_string() {
   i := 42
 
diff --git a/vlib/compiler/tests/struct_chained_fields_correct_test.v b/vlib/compiler/tests/struct_chained_fields_correct_test.v
new file mode 100644
index 0000000000..3a5581dbc9
--- /dev/null
+++ b/vlib/compiler/tests/struct_chained_fields_correct_test.v
@@ -0,0 +1,26 @@
+
+struct Axx { mut: v int } 
+struct Bxx {      a Axx } 
+struct Cxx { mut: b Bxx }  
+struct Dxx { mut: c Cxx } 
+struct Exx { mut: v []int } 
+struct Fxx { e []Exx }
+
+fn test_chained_string(){
+	mut b := Bxx{} b = Bxx{Axx{2}} 
+	assert 'b is: ' + b.a.v.str() == 'b is: 2'
+}
+
+fn test_chained_assignments(){
+  mut c := Cxx{} 
+  c.b = Bxx{}
+  mut d := Dxx{} 
+  d.c.b = Bxx{}
+  assert true
+}  
+
+fn test_chained_array_access(){
+  f := Fxx{[Exx{[10,20,30]},Exx{[100,200,300,400]}]}
+  assert 'f.e[0].v.len: 3' == 'f.e[0].v.len: ${f.e[0].v.len}'
+  assert 'f.e[1].v.len: 4' == 'f.e[1].v.len: ${f.e[1].v.len}'
+}