tawasuyu/taffy

diff --git a/Cargo.toml b/Cargo.toml
index e72b9d63c..271404b3e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,12 +16,12 @@ circle-ci = { repository = "vislyhq/stretch", branch = "master" }
 maintenance = { status = "experimental" }
 
 [dependencies]
-hashbrown = "0.6.0"
-lazy_static = "1.3"
+hashbrown = "0.6.3"
+lazy_static = "1.4"
 spin = "0.5.2"
 
 [dependencies.serde]
-version = "1.0.99"
+version = "1.0.102"
 features = ["serde_derive"]
 optional = true
 
@@ -32,7 +32,7 @@ serde_camel_case = ["serde"]
 serde_kebab_case = ["serde"]
 
 [dev-dependencies]
-criterion = "0.2"
+criterion = "0.3.0"
 
 [profile.release]
 lto = true
diff --git a/scripts/gentest/Cargo.toml b/scripts/gentest/Cargo.toml
index 83573f292..c639330fc 100644
--- a/scripts/gentest/Cargo.toml
+++ b/scripts/gentest/Cargo.toml
@@ -5,15 +5,15 @@ authors = ["Emil Sjölander <emil@visly.app>"]
 edition = "2018"
 
 [dependencies]
-env_logger = "0.6"
+env_logger = "0.7.1"
 failure = "0.1"
-fantoccini = "0.11.7"
+fantoccini = "0.11.9"
 futures = "0.1"
-indicatif = "0.11"
-json = "0.11.13"
+indicatif = "0.13.0"
+json = "0.12.0"
 log = "0.4"
-proc-macro2 = "0.4"
-quote = "0.6"
+proc-macro2 = "1.0.6"
+quote = "1.0.2"
 serde_json = "1"
-syn = "0.15"
+syn = "1.0.7"
 tokio = "0.1"
diff --git a/src/algo.rs b/src/algo.rs
index d4bde363f..cb902d15f 100644
--- a/src/algo.rs
+++ b/src/algo.rs
@@ -110,7 +110,7 @@ impl Forest {
         Ok(())
     }
 
-    fn round_layout(nodes: &mut Vec<NodeData>, children: &Vec<Vec<NodeId>>, root: NodeId, abs_x: f32, abs_y: f32) {
+    fn round_layout(nodes: &mut Vec<NodeData>, children: &[Vec<NodeId>], root: NodeId, abs_x: f32, abs_y: f32) {
         let layout = &mut nodes[root].layout;
         let abs_x = abs_x + layout.location.x;
         let abs_y = abs_y + layout.location.y;
@@ -124,6 +124,7 @@ impl Forest {
         }
     }
 
+    #[allow(clippy::cognitive_complexity)]
     fn compute_internal(
         &mut self,
         node: NodeId,
@@ -268,9 +269,9 @@ impl Forest {
             })
             .collect();
 
-        let has_baseline_child = flex_items.iter().fold(false, |result, child| {
-            result || self.nodes[child.node].style.align_self(&self.nodes[node].style) == AlignSelf::Baseline
-        });
+        let has_baseline_child = flex_items
+            .iter()
+            .any(|child| self.nodes[child.node].style.align_self(&self.nodes[node].style) == AlignSelf::Baseline);
 
         // TODO - this does not follow spec. See commented out code below
         // 3. Determine the flex base size and hypothetical main size of each item:
@@ -1340,7 +1341,7 @@ impl Forest {
             }
         }
 
-        fn hidden_layout(nodes: &mut Vec<NodeData>, children: &Vec<Vec<NodeId>>, node: NodeId, order: u32) {
+        fn hidden_layout(nodes: &mut Vec<NodeData>, children: &[Vec<NodeId>], node: NodeId, order: u32) {
             nodes[node].layout =
                 result::Layout { order, size: Size { width: 0.0, height: 0.0 }, location: Point { x: 0.0, y: 0.0 } };
 
diff --git a/src/forest.rs b/src/forest.rs
index 06422c805..fd5e542d8 100644
--- a/src/forest.rs
+++ b/src/forest.rs
@@ -116,7 +116,7 @@ impl Forest {
 
         let last = self.nodes.len();
 
-        return if last != node {
+        if last != node {
             // Update ids for every child of the swapped in node.
             for child in &self.children[last] {
                 for parent in &mut self.parents[*child] {
@@ -143,7 +143,7 @@ impl Forest {
             self.children.swap_remove(node);
             self.parents.swap_remove(node);
             None
-        };
+        }
     }
 
     pub unsafe fn remove_child(&mut self, node: NodeId, child: NodeId) -> NodeId {
@@ -159,7 +159,7 @@ impl Forest {
     }
 
     pub fn mark_dirty(&mut self, node: NodeId) {
-        fn mark_dirty_impl(nodes: &mut Vec<NodeData>, parents: &Vec<Vec<NodeId>>, node_id: NodeId) {
+        fn mark_dirty_impl(nodes: &mut Vec<NodeData>, parents: &[Vec<NodeId>], node_id: NodeId) {
             let node = &mut nodes[node_id];
             node.layout_cache = None;
             node.is_dirty = true;
diff --git a/src/node.rs b/src/node.rs
index 2a101749c..fb40d0b9f 100644
--- a/src/node.rs
+++ b/src/node.rs
@@ -37,11 +37,15 @@ pub struct Stretch {
     forest: Forest,
 }
 
-impl Stretch {
-    const DEFAULT_CAPACITY: usize = 16;
+impl Default for Stretch {
+    fn default() -> Self {
+        Stretch::with_capacity(16)
+    }
+}
 
+impl Stretch {
     pub fn new() -> Self {
-        Self::with_capacity(Self::DEFAULT_CAPACITY)
+        Default::default()
     }
 
     pub fn with_capacity(capacity: usize) -> Self {