Get to the point of needing to construct/reference fields.

src/syntax/tokens.rs

@@ -206,14 +206,6 @@ impl From<ConstantType> for cranelift_codegen::ir::Type {
 }
 
 impl ConstantType {
-    /// Returns true if the given type is (a) numeric and (b) signed;
-    pub fn is_signed(&self) -> bool {
-        matches!(
-            self,
-            ConstantType::I8 | ConstantType::I16 | ConstantType::I32 | ConstantType::I64
-        )
-    }
-
     /// Return the set of types that can be safely casted into this type.
     pub fn safe_casts_to(self) -> Vec<ConstantType> {
         match self {