diff --git a/Cargo.toml b/Cargo.toml
index e344f41b..4b1a692f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -158,7 +158,7 @@ rustc-hash = "2.0"
 scc = "2"
 scoped-tls = "1.0"
 semver = "1.0"
-smallvec = "1"
+smallvec = { version = "1", features = ["const_generics", "union"] }
 thread_local = "1.1"
 tikv-jemallocator = "0.6"
 typed-arena = "2.0"
diff --git a/crates/data-structures/Cargo.toml b/crates/data-structures/Cargo.toml
index 4f820afa..96beeb9d 100644
--- a/crates/data-structures/Cargo.toml
+++ b/crates/data-structures/Cargo.toml
@@ -25,7 +25,7 @@ index_vec.workspace = true
 indexmap.workspace = true
 parking_lot.workspace = true
 rustc-hash.workspace = true
-smallvec = { workspace = true, features = ["union"] }
+smallvec.workspace = true
 
 [features]
 nightly = [
diff --git a/crates/data-structures/src/index.rs b/crates/data-structures/src/index.rs
index 504d66ff..69b43a39 100644
--- a/crates/data-structures/src/index.rs
+++ b/crates/data-structures/src/index.rs
@@ -74,6 +74,7 @@ macro_rules! base_index {
         }
 
         impl fmt::Debug for $name {
+            #[inline]
             fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                 self.value.fmt(f)
             }
diff --git a/crates/sema/src/ast_lowering/resolve.rs b/crates/sema/src/ast_lowering/resolve.rs
index 5b714b78..216d85dd 100644
--- a/crates/sema/src/ast_lowering/resolve.rs
+++ b/crates/sema/src/ast_lowering/resolve.rs
@@ -3,7 +3,7 @@ use solar_ast::ast;
 use solar_data_structures::{
     index::{Idx, IndexVec},
     map::{FxIndexMap, IndexEntry},
-    smallvec::{smallvec, SmallVec},
+    smallvec::SmallVec,
     BumpExt,
 };
 use solar_interface::{
@@ -1109,16 +1109,16 @@ impl Declarations {
     ) -> Result<(), Declaration> {
         match self.declarations.entry(name) {
             IndexEntry::Occupied(entry) => {
-                if let Some(conflict) = Self::conflicting_declaration(hir, decl, entry.get()) {
+                let declarations = entry.into_mut();
+                if let Some(conflict) = Self::conflicting_declaration(hir, decl, declarations) {
                     return Err(conflict);
                 }
-                let declarations = entry.into_mut();
                 if !declarations.contains(&decl) {
                     declarations.push(decl);
                 }
             }
             IndexEntry::Vacant(entry) => {
-                entry.insert(smallvec![decl]);
+                entry.insert(SmallVec::from_buf([decl]));
             }
         }
         Ok(())
diff --git a/crates/sema/src/hir.rs b/crates/sema/src/hir.rs
index e37ed141..44644c1a 100644
--- a/crates/sema/src/hir.rs
+++ b/crates/sema/src/hir.rs
@@ -166,6 +166,7 @@ impl<'hir> Hir<'hir> {
     }
 
     /// Returns the item associated with the given ID.
+    #[inline]
     pub fn item(&self, id: impl Into<ItemId>) -> Item<'_, 'hir> {
         match id.into() {
             ItemId::Contract(id) => Item::Contract(self.contract(id)),
@@ -289,6 +290,7 @@ pub enum Item<'a, 'hir> {
 
 impl Item<'_, '_> {
     /// Returns the name of the item.
+    #[inline]
     pub fn name(self) -> Option<Ident> {
         match self {
             Item::Contract(c) => Some(c.name),
@@ -303,6 +305,7 @@ impl Item<'_, '_> {
     }
 
     /// Returns the description of the item.
+    #[inline]
     pub fn description(self) -> &'static str {
         match self {
             Item::Contract(c) => c.kind.to_str(),
@@ -317,6 +320,7 @@ impl Item<'_, '_> {
     }
 
     /// Returns the span of the item.
+    #[inline]
     pub fn span(self) -> Span {
         match self {
             Item::Contract(c) => c.span,
@@ -331,6 +335,7 @@ impl Item<'_, '_> {
     }
 
     /// Returns the contract ID if this item is part of a contract.
+    #[inline]
     pub fn contract(self) -> Option<ContractId> {
         match self {
             Item::Contract(_) => None,
diff --git a/crates/sema/src/ty/mod.rs b/crates/sema/src/ty/mod.rs
index 2183c627..b3b32f24 100644
--- a/crates/sema/src/ty/mod.rs
+++ b/crates/sema/src/ty/mod.rs
@@ -453,7 +453,7 @@ pub fn interface_functions(gcx: _, id: hir::ContractId) -> InterfaceFunctions<'g
             gcx.dcx().err(msg).span(c.name.span).span_note(f.span, "first function").span_note(f2.span, "second function").note(full_note).emit();
         }
 
-        Some(InterfaceFunction{ selector, id: f_id, ty })
+        Some(InterfaceFunction { selector, id: f_id, ty })
     });
     let functions = gcx.bump().alloc_from_iter(functions);
     let inheritance_start = inheritance_start.expect("linearized_bases did not contain self ID");