diff --git a/ci/linux_ci.vsh b/ci/linux_ci.vsh
index 1c5c90e9e2..a97e3a56ba 100644
--- a/ci/linux_ci.vsh
+++ b/ci/linux_ci.vsh
@@ -131,12 +131,19 @@ fn build_fast_tcc() {
 
 fn v_self_compilation_usecache_tcc() {
 	exec('unset VFLAGS')
+
+	exec('v wipe-cache')
 	exec('v -usecache examples/hello_world.v')
 	exec('./examples/hello_world')
+
+	exec('v wipe-cache')
 	exec('v -o v2 -usecache cmd/v')
 	exec('./v2 -o v3 -usecache cmd/v')
 	exec('./v3 version')
+
+	exec('v wipe-cache')
 	exec('./v3 -o tetris -usecache examples/tetris/tetris.v')
+	exec('rm -f ./examples/hello_world v2 v3 tetris')
 }
 
 fn test_password_input_tcc() {
@@ -198,13 +205,18 @@ fn v_self_compilation_gcc() {
 fn v_self_compilation_usecache_gcc() {
 	exec('unset VFLAGS')
 
+	exec('v wipe-cache')
 	exec('v -usecache examples/hello_world.v')
 	exec('examples/hello_world')
 
+	exec('v wipe-cache')
 	exec('v -o v2 -usecache cmd/v')
 	exec('./v2 -o v3 -usecache cmd/v')
 	exec('./v3 version')
+
+	exec('v wipe-cache')
 	exec('./v3 -o tetris -usecache examples/tetris/tetris.v')
+	exec('rm -f ./examples/hello_world v2 v3 tetris')
 }
 
 fn verify_v_test_works_gcc() {
@@ -312,11 +324,17 @@ fn v_self_compilation_clang() {
 
 fn v_self_compilation_usecache_clang() {
 	exec('unset VFLAGS')
+
+	exec('v wipe-cache')
 	exec('v -usecache examples/hello_world.v')
 	exec('./examples/hello_world')
+
+	exec('v wipe-cache')
 	exec('v -o v2 -usecache cmd/v')
 	exec('./v2 -o v3 -usecache cmd/v')
 	exec('./v3 version')
+
+	exec('v wipe-cache')
 	exec('./v3 -o tetris -usecache examples/tetris/tetris.v')
 	exec('rm -f ./examples/hello_world v2 v3 tetris')
 }
diff --git a/vlib/time/duration.v b/vlib/time/duration.v
index 2d61394a0b..aa2e08034b 100644
--- a/vlib/time/duration.v
+++ b/vlib/time/duration.v
@@ -3,6 +3,7 @@ module time
 // A lot of these are taken from the Go library.
 pub type Duration = i64
 
+@[markused]
 pub const nanosecond = Duration(1)
 pub const microsecond = Duration(1000 * nanosecond)
 pub const millisecond = Duration(1000 * microsecond)
diff --git a/vlib/v/ast/ast.v b/vlib/v/ast/ast.v
index 2438743ce9..fdbe84f6b7 100644
--- a/vlib/v/ast/ast.v
+++ b/vlib/v/ast/ast.v
@@ -1483,6 +1483,7 @@ pub:
 	pos      token.Pos
 	type_pos token.Pos
 	comments []Comment
+	attrs    []Attr // attributes like @[deprecated] etc
 pub mut:
 	parent_type Type
 	is_markused bool
diff --git a/vlib/v/fmt/fmt.v b/vlib/v/fmt/fmt.v
index c95643f223..cded853c41 100644
--- a/vlib/v/fmt/fmt.v
+++ b/vlib/v/fmt/fmt.v
@@ -1686,6 +1686,7 @@ pub fn (mut f Fmt) type_decl(node ast.TypeDecl) {
 }
 
 pub fn (mut f Fmt) alias_type_decl(node ast.AliasTypeDecl) {
+	f.attrs(node.attrs)
 	if node.is_pub {
 		f.write('pub ')
 	}
diff --git a/vlib/v/fmt/tests/attrs_keep.vv b/vlib/v/fmt/tests/attrs_keep.vv
index d8976652ca..d027a8538a 100644
--- a/vlib/v/fmt/tests/attrs_keep.vv
+++ b/vlib/v/fmt/tests/attrs_keep.vv
@@ -30,3 +30,7 @@ enum Example {
 	value1       = 1
 	value1_again = 1
 }
+
+@[deprecated: 'use Example instead']
+@[deprecated_after: '2040-01-24']
+pub type Alias = Example
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index c098a8900f..7af252379c 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -2749,6 +2749,7 @@ fn (mut p Parser) type_decl() ast.TypeDecl {
 		return ast.AliasTypeDecl{}
 	}
 	comments = sum_variants[0].end_comments.clone()
+	p.attrs = []
 	return ast.AliasTypeDecl{
 		name:        name
 		is_pub:      is_pub
@@ -2758,6 +2759,7 @@ fn (mut p Parser) type_decl() ast.TypeDecl {
 		pos:         decl_pos
 		comments:    comments
 		is_markused: attrs.contains('markused')
+		attrs:       attrs
 	}
 }