diff --git a/vlib/builtin/string.v b/vlib/builtin/string.v
index a849541fbe..0d081e521e 100644
--- a/vlib/builtin/string.v
+++ b/vlib/builtin/string.v
@@ -550,7 +550,7 @@ pub fn (s string) index_old(p string) int {
 	mut i := 0
 	for i < s.len {
 		mut j := 0
-		for j < p.len && s[i + j] == p[j] {
+		for j < p.len && s.str[i + j] == p.str[j] {
 			j++
 		}
 		if j == p.len {
@@ -568,7 +568,7 @@ pub fn (s string) index(p string) ?int {
 	mut i := 0
 	for i < s.len {
 		mut j := 0
-		for j < p.len && s[i + j] == p[j] {
+		for j < p.len && s.str[i + j] == p.str[j] {
 			j++
 		}
 		if j == p.len {
@@ -587,20 +587,20 @@ fn (s string) index_kmp(p string) int {
 	mut prefix := [0].repeat(p.len)
 	mut j := 0
 	for i := 1; i < p.len; i++ {
-		for p[j] != p[i] && j > 0 {
+		for p.str[j] != p.str[i] && j > 0 {
 			j = prefix[j - 1]
 		}
-		if p[j] == p[i] {
+		if p.str[j] == p.str[i] {
 			j++
 		}
 		prefix[i] = j
 	}
 	j = 0
 	for i in 0..s.len {
-		for p[j] != s[i] && j > 0 {
+		for p.str[j] != s.str[i] && j > 0 {
 			j = prefix[j - 1]
 		}
-		if p[j] == s[i] {
+		if p.str[j] == s.str[i] {
 			j++
 		}
 		if j == p.len {
@@ -627,7 +627,7 @@ pub fn (s string) last_index(p string) ?int {
 	mut i := s.len - p.len
 	for i >= 0 {
 		mut j := 0
-		for j < p.len && s[i + j] == p[j] {
+		for j < p.len && s.str[i + j] == p.str[j] {
 			j++
 		}
 		if j == p.len {
@@ -653,7 +653,7 @@ pub fn (s string) index_after(p string, start int) int {
 	for i < s.len {
 		mut j := 0
 		mut ii := i
-		for j < p.len && s[ii] == p[j] {
+		for j < p.len && s.str[ii] == p.str[j] {
 			j++
 			ii++
 		}
@@ -667,7 +667,7 @@ pub fn (s string) index_after(p string, start int) int {
 
 pub fn (s string) index_byte(c byte) int {
 	for i in 0..s.len {
-		if s[i] == c {
+		if s.str[i] == c {
 			return i
 		}
 	}
@@ -676,7 +676,7 @@ pub fn (s string) index_byte(c byte) int {
 
 pub fn (s string) last_index_byte(c byte) int {
 	for i := s.len - 1; i >= 0; i-- {
-		if s[i] == c {
+		if s.str[i] == c {
 			return i
 		}
 	}
@@ -716,7 +716,7 @@ pub fn (s string) starts_with(p string) bool {
 		return false
 	}
 	for i in 0..p.len {
-		if s[i] != p[i] {
+		if s.str[i] != p.str[i] {
 			return false
 		}
 	}
diff --git a/vlib/compiler/gen_c.v b/vlib/compiler/gen_c.v
index 78b8f70131..40496c61f2 100644
--- a/vlib/compiler/gen_c.v
+++ b/vlib/compiler/gen_c.v
@@ -565,7 +565,7 @@ fn (p mut Parser) cast(typ string) {
 	p.expected_type = typ
 	expr_typ := p.bool_expression()
 	// Do not allow `int(my_int)`
-	if expr_typ == typ && typ != 'u64' {
+	if expr_typ == typ {
 		p.warn('casting `$typ` to `$expr_typ` is not needed')
 	}
 	// `face := FT_Face(cobj)` => `FT_Face face = *((FT_Face*)cobj);`
diff --git a/vlib/compiler/main.v b/vlib/compiler/main.v
index 13c1d201c5..d5c9af182b 100644
--- a/vlib/compiler/main.v
+++ b/vlib/compiler/main.v
@@ -546,7 +546,7 @@ pub fn (v &V) v_files_from_dir(dir string) []string {
 		verror("$dir doesn't exist")
 	}
 	else if !os.is_dir(dir) {
-		verror("$dir isn't a directory")
+		verror("$dir isn't a directory!")
 	}
 	mut files := os.ls(dir)or{
 		panic(err)
diff --git a/vlib/compiler/modules.v b/vlib/compiler/modules.v
index 555188b5fb..92cd22ae9a 100644
--- a/vlib/compiler/modules.v
+++ b/vlib/compiler/modules.v
@@ -170,10 +170,15 @@ fn (v mut V) set_module_lookup_paths() {
 		v.module_lookup_paths << os.base_dir(v.compiled_dir) // pdir of _test.v
 	}
 	v.module_lookup_paths << v.compiled_dir
+	x := os.join_path(v.compiled_dir, 'modules')
+	if v.pref.verbosity.is_higher_or_equal(.level_two) {
+		println('x: "$x"')
+	}
 	v.module_lookup_paths << os.join_path(v.compiled_dir, 'modules')
 	v.module_lookup_paths << v.pref.lookup_path
 	if v.pref.verbosity.is_higher_or_equal(.level_two) {
-		v.log('v.module_lookup_paths: $v.module_lookup_paths')
+		v.log('v.module_lookup_paths') //: $v.module_lookup_paths')
+		println(v.module_lookup_paths)
 	}
 }
 
diff --git a/vlib/os/os.v b/vlib/os/os.v
index 03ff9a9bd0..200d92795b 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -935,7 +935,8 @@ pub fn is_dir(path string) bool {
 			return false
 		}
 		// ref: https://code.woboq.org/gcc/include/sys/stat.h.html
-		return int(statbuf.st_mode) & S_IFMT == S_IFDIR
+		val:= int(statbuf.st_mode) & S_IFMT
+		return val == S_IFDIR
 	}
 }
 
diff --git a/vlib/v/builder/builder.v b/vlib/v/builder/builder.v
index 5e952ef740..9aa5d79626 100644
--- a/vlib/v/builder/builder.v
+++ b/vlib/v/builder/builder.v
@@ -132,7 +132,7 @@ pub fn (b &Builder) v_files_from_dir(dir string) []string {
 		verror("$dir doesn't exist")
 	}
 	else if !os.is_dir(dir) {
-		verror("$dir isn't a directory")
+		verror("$dir isn't a directory!")
 	}
 	mut files := os.ls(dir) or {
 		panic(err)
@@ -206,7 +206,7 @@ fn module_path(mod string) string {
 pub fn (b &Builder) find_module_path(mod string) ?string {
 	mod_path := module_path(mod)
 	for search_path in b.module_search_paths {
-		try_path := os.join_path(search_path, mod_path)
+		try_path := os.join_path(search_path,mod_path)
 		if b.pref.verbosity.is_higher_or_equal(.level_three) {
 			println('  >> trying to find $mod in $try_path ..')
 		}