diff --git a/Cargo.lock b/Cargo.lock
index cf7fb70..39d7cd3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "ahash"
 version = "0.3.8"
@@ -21,7 +23,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -30,7 +32,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -100,7 +102,7 @@ checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 dependencies = [
  "hermit-abi",
  "libc",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -193,12 +195,6 @@ version = "1.0.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3c69b077ad434294d3ce9f1f6143a2a4b89a8a2d54ef813d85003a4fd1137fd"
 
-[[package]]
-name = "cfg-if"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
-
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -316,6 +312,7 @@ dependencies = [
  "glib",
  "grass",
  "gtk",
+ "inotify",
  "itertools 0.10.0",
  "lazy_static",
  "libc",
@@ -323,7 +320,6 @@ dependencies = [
  "maplit",
  "nix",
  "nom",
- "notify",
  "num",
  "pretty_assertions",
  "pretty_env_logger",
@@ -353,53 +349,6 @@ dependencies = [
  "syn 1.0.64",
 ]
 
-[[package]]
-name = "filetime"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d34cfa13a63ae058bfa601fe9e313bbdb3746427c1459185464ce0fcf62e1e8"
-dependencies = [
- "cfg-if 1.0.0",
- "libc",
- "redox_syscall",
- "winapi 0.3.9",
-]
-
-[[package]]
-name = "fsevent"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ab7d1bd1bd33cc98b0889831b72da23c0aa4df9cec7e0702f46ecea04b35db6"
-dependencies = [
- "bitflags",
- "fsevent-sys",
-]
-
-[[package]]
-name = "fsevent-sys"
-version = "2.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f41b048a94555da0f42f1d632e2e19510084fb8e303b0daa2816e733fb3644a0"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
-dependencies = [
- "bitflags",
- "fuchsia-zircon-sys",
-]
-
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
-
 [[package]]
 name = "funty"
 version = "1.1.0"
@@ -609,7 +558,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e692e296bfac1d2533ef168d0b60ff5897b8b70a4009276834014dd8924cc028"
 dependencies = [
  "libc",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -618,7 +567,7 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
  "libc",
  "wasi",
 ]
@@ -654,7 +603,7 @@ dependencies = [
  "gobject-sys",
  "libc",
  "system-deps",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -834,13 +783,15 @@ dependencies = [
 
 [[package]]
 name = "inotify"
-version = "0.7.1"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4816c66d2c8ae673df83366c18341538f234a26d65a9ecea5c348b453ac1d02f"
+checksum = "d19f57db1baad9d09e43a3cd76dcf82ebdafd37d75c9498b87762dba77c93f15"
 dependencies = [
  "bitflags",
+ "futures-core",
  "inotify-sys",
  "libc",
+ "tokio",
 ]
 
 [[package]]
@@ -858,16 +809,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "61124eeebbd69b8190558df225adf7e4caafce0d743919e5d6b19652314ec5ec"
 dependencies = [
- "cfg-if 1.0.0",
-]
-
-[[package]]
-name = "iovec"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2b3ea6ff95e175473f8ffe6a7eb7c00d054240321b84c57051175fe3c1e075e"
-dependencies = [
- "libc",
+ "cfg-if",
 ]
 
 [[package]]
@@ -888,16 +830,6 @@ dependencies = [
  "either",
 ]
 
-[[package]]
-name = "kernel32-sys"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-dependencies = [
- "winapi 0.2.8",
- "winapi-build",
-]
-
 [[package]]
 name = "lasso"
 version = "0.3.1"
@@ -913,12 +845,6 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
-[[package]]
-name = "lazycell"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
-
 [[package]]
 name = "lexical-core"
 version = "0.7.5"
@@ -927,7 +853,7 @@ checksum = "21f866863575d0e1d654fbeeabdc927292fdf862873dc3c96c6f753357e13374"
 dependencies = [
  "arrayvec",
  "bitflags",
- "cfg-if 1.0.0",
+ "cfg-if",
  "ryu",
  "static_assertions",
 ]
@@ -953,7 +879,7 @@ version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
 ]
 
 [[package]]
@@ -968,25 +894,6 @@ version = "2.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
-[[package]]
-name = "mio"
-version = "0.6.23"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4afd66f5b91bf2a3bc13fad0e21caedac168ca4c707504e75585648ae80e4cc4"
-dependencies = [
- "cfg-if 0.1.10",
- "fuchsia-zircon",
- "fuchsia-zircon-sys",
- "iovec",
- "kernel32-sys",
- "libc",
- "log",
- "miow 0.2.2",
- "net2",
- "slab",
- "winapi 0.2.8",
-]
-
 [[package]]
 name = "mio"
 version = "0.7.11"
@@ -995,33 +902,9 @@ checksum = "cf80d3e903b34e0bd7282b218398aec54e082c840d9baf8339e0080a0c542956"
 dependencies = [
  "libc",
  "log",
- "miow 0.3.7",
+ "miow",
  "ntapi",
- "winapi 0.3.9",
-]
-
-[[package]]
-name = "mio-extras"
-version = "2.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52403fe290012ce777c4626790c8951324a2b9e3316b3143779c72b029742f19"
-dependencies = [
- "lazycell",
- "log",
- "mio 0.6.23",
- "slab",
-]
-
-[[package]]
-name = "miow"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebd808424166322d4a38da87083bfddd3ac4c131334ed55856112eb06d46944d"
-dependencies = [
- "kernel32-sys",
- "net2",
- "winapi 0.2.8",
- "ws2_32-sys",
+ "winapi",
 ]
 
 [[package]]
@@ -1030,18 +913,7 @@ version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9f1c5b025cda876f66ef43a113f91ebc9f4ccef34843000e0adf6ebbab84e21"
 dependencies = [
- "winapi 0.3.9",
-]
-
-[[package]]
-name = "net2"
-version = "0.2.37"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "391630d12b68002ae1e25e8f974306474966550ad82dac6886fb8910c19568ae"
-dependencies = [
- "cfg-if 0.1.10",
- "libc",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1052,7 +924,7 @@ checksum = "fa9b4819da1bc61c0ea48b63b7bc8604064dd43013e7cc325df098d49cd7c18a"
 dependencies = [
  "bitflags",
  "cc",
- "cfg-if 1.0.0",
+ "cfg-if",
  "libc",
 ]
 
@@ -1069,31 +941,13 @@ dependencies = [
  "version_check",
 ]
 
-[[package]]
-name = "notify"
-version = "4.0.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80ae4a7688d1fab81c5bf19c64fc8db920be8d519ce6336ed4e7efe024724dbd"
-dependencies = [
- "bitflags",
- "filetime",
- "fsevent",
- "fsevent-sys",
- "inotify",
- "libc",
- "mio 0.6.23",
- "mio-extras",
- "walkdir",
- "winapi 0.3.9",
-]
-
 [[package]]
 name = "ntapi"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f6bb902e437b6d86e03cce10a7e2af662292c5dfef23b65899ea3ac9354ad44"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1217,7 +1071,7 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53cdc5b785b7a58c5aad8216b3dfa114df64b0b06ae6e1501cef91df2fbdf8f9"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1264,12 +1118,12 @@ version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fa7a782938e745763fe6907fc6ba86946d72f49fe7e21de074e08128a99fb018"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
  "instant",
  "libc",
  "redox_syscall",
  "smallvec",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1544,15 +1398,6 @@ version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
 
-[[package]]
-name = "same-file"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
-dependencies = [
- "winapi-util",
-]
-
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
@@ -1781,14 +1626,14 @@ dependencies = [
  "bytes",
  "libc",
  "memchr",
- "mio 0.7.11",
+ "mio",
  "num_cpus",
  "once_cell",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
  "tokio-macros",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1893,29 +1738,12 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "walkdir"
-version = "2.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
-dependencies = [
- "same-file",
- "winapi 0.3.9",
- "winapi-util",
-]
-
 [[package]]
 name = "wasi"
 version = "0.9.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
-[[package]]
-name = "winapi"
-version = "0.2.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -1926,12 +1754,6 @@ dependencies = [
  "winapi-x86_64-pc-windows-gnu",
 ]
 
-[[package]]
-name = "winapi-build"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
@@ -1944,7 +1766,7 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1953,7 +1775,7 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "44c17110f57155602a80dca10be03852116403c9ff3cd25b079d666f2aa3df6e"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -1962,16 +1784,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
-[[package]]
-name = "ws2_32-sys"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
-dependencies = [
- "winapi 0.2.8",
- "winapi-build",
-]
-
 [[package]]
 name = "wyz"
 version = "0.2.0"
@@ -1996,7 +1808,7 @@ checksum = "6ffb080b3f2f616242a4eb8e7d325035312127901025b0052bc3154a282d0f19"
 dependencies = [
  "gethostname",
  "nix",
- "winapi 0.3.9",
+ "winapi",
  "winapi-wsapoll",
 ]
 
diff --git a/src/value/attr_value/attr_value.rs b/src/value/attr_value/attr_value.rs
index 3bd0be0..afc0550 100644
--- a/src/value/attr_value/attr_value.rs
+++ b/src/value/attr_value/attr_value.rs
@@ -43,6 +43,10 @@ impl AttrValue {
         AttrValue(vec![AttrValueElement::Primitive(v.into())])
     }
 
+    pub fn from_var_ref<T: Into<VarName>>(v: T) -> Self {
+        AttrValue(vec![AttrValueElement::Expr(AttrValueExpr::VarRef(v.into()))])
+    }
+
     pub fn iter(&self) -> std::slice::Iter<AttrValueElement> {
         self.0.iter()
     }
diff --git a/src/value/attr_value/attr_value_expr.rs b/src/value/attr_value/attr_value_expr.rs
index 888a32d..321b97f 100644
--- a/src/value/attr_value/attr_value_expr.rs
+++ b/src/value/attr_value/attr_value_expr.rs
@@ -51,7 +51,7 @@ impl std::fmt::Display for UnaryOp {
     }
 }
 
-#[derive(Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Clone, PartialEq, Serialize, Deserialize, Debug)]
 pub enum AttrValueExpr {
     Literal(AttrValue),
     VarRef(VarName),
@@ -72,11 +72,10 @@ impl std::fmt::Display for AttrValueExpr {
     }
 }
 
-impl std::fmt::Debug for AttrValueExpr {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self)
-    }
-}
+// impl std::fmt::Debug for AttrValueExpr {
+// fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+// write!(f, "{:?}", self)
+//}
 
 impl AttrValueExpr {
     pub fn map_terminals_into(self, f: impl Fn(Self) -> Self) -> Self {
@@ -92,7 +91,8 @@ impl AttrValueExpr {
     pub fn resolve_refs(self, variables: &HashMap<VarName, PrimitiveValue>) -> Result<Self> {
         use AttrValueExpr::*;
         match self {
-            Literal(x) => Ok(AttrValueExpr::Literal(x)),
+            // Literal(x) => Ok(Literal(AttrValue::from_primitive(x.resolve_fully(&variables)?))),
+            Literal(x) => Ok(Literal(x)),
             VarRef(ref name) => Ok(Literal(AttrValue::from_primitive(
                 variables.get(name).with_context(|| format!("Unknown variable {} referenced in {:?}", &name, &self))?.clone(),
             ))),
@@ -107,7 +107,7 @@ impl AttrValueExpr {
     pub fn var_refs(&self) -> Vec<&VarName> {
         use AttrValueExpr::*;
         match self {
-            Literal(_) => vec![],
+            Literal(s) => s.var_refs().collect(),
             VarRef(name) => vec![name],
             BinOp(box a, _, box b) => {
                 let mut refs = a.var_refs();