better type assertion ergonomic

fix-vm/src/instructions/variables.rs

@@ -1,15 +1,15 @@
-use crate::{BytecodeReader, Mutation, StepResult, Value};
+use crate::{BytecodeReader, Mutation, Step, Value};
 
 impl<'gc> crate::Vm<'gc> {
     #[inline(always)]
-    pub(crate) fn op_load_local(&mut self, reader: &mut BytecodeReader<'_>) -> StepResult {
+    pub(crate) fn op_load_local(&mut self, reader: &mut BytecodeReader<'_>) -> Step {
         let idx = reader.read_u32() as usize;
-        self.push_stack(self.env.borrow().locals[idx]);
-        StepResult::Continue
+        self.push(self.env.borrow().locals[idx]);
+        Step::Continue
     }
 
     #[inline(always)]
-    pub(crate) fn op_load_outer(&mut self, reader: &mut BytecodeReader<'_>) -> StepResult {
+    pub(crate) fn op_load_outer(&mut self, reader: &mut BytecodeReader<'_>) -> Step {
         let layer = reader.read_u8();
         let idx = reader.read_u32() as usize;
         let mut cur = self.env;
@@ -18,8 +18,8 @@ impl<'gc> crate::Vm<'gc> {
             cur = prev;
         }
         let val = cur.borrow().locals[idx];
-        self.push_stack(val);
-        StepResult::Continue
+        self.push(val);
+        Step::Continue
     }
 
     #[inline(always)]
@@ -27,11 +27,11 @@ impl<'gc> crate::Vm<'gc> {
         &mut self,
         reader: &mut BytecodeReader<'_>,
         mc: &Mutation<'gc>,
-    ) -> StepResult {
+    ) -> Step {
         let idx = reader.read_u32() as usize;
-        let val = self.pop_stack();
+        let val = self.pop();
         self.env.borrow_mut(mc).locals[idx] = val;
-        StepResult::Continue
+        Step::Continue
     }
 
     #[inline(always)]
@@ -39,12 +39,12 @@ impl<'gc> crate::Vm<'gc> {
         &mut self,
         reader: &mut BytecodeReader<'_>,
         mc: &Mutation<'gc>,
-    ) -> StepResult {
+    ) -> Step {
         let count = reader.read_u32() as usize;
         self.env
             .borrow_mut(mc)
             .locals
             .extend(std::iter::repeat_n(Value::default(), count));
-        StepResult::Continue
+        Step::Continue
     }
 }