better force eval ergonomic

fix-vm/src/lib.rs

@@ -21,12 +21,14 @@ mod boxing;
 mod bytecode_reader;
 #[cfg(feature = "tailcall")]
 mod dispatch_tailcall;
+mod forced;
 mod value;
 pub use value::StaticValue;
 use value::*;
 mod helpers;
 pub(crate) mod instructions;
 pub(crate) use bytecode_reader::BytecodeReader;
+pub(crate) use forced::Forced;
 use helpers::*;
 
 type VmResult<T> = std::result::Result<T, VmError>;
@@ -346,27 +348,17 @@ impl<'gc> Vm<'gc> {
     }
 
     #[inline(always)]
-    pub(crate) fn pop_forced_expect_inline<T: InlineStorable>(&mut self) -> std::result::Result<T, NixType> {
-        self.pop_forced().expect_inline::<T>()
+    pub(crate) fn try_force<T: Forced<'gc>>(
+        &mut self,
+        reader: &mut BytecodeReader<'_>,
+        mc: &Mutation<'gc>,
+    ) -> std::ops::ControlFlow<Break, T> {
+        T::force_and_check(self, reader, mc, 0)?;
+        std::ops::ControlFlow::Continue(T::pop_converted(self))
     }
 
     #[inline(always)]
-    pub(crate) fn pop_forced_expect_gc<T: GcStorable>(&mut self) -> std::result::Result<Gc<'gc, T>, NixType> {
-        self.pop_forced().expect_gc::<T>()
-    }
-
-    #[inline(always)]
-    pub(crate) fn pop_forced_expect_num(&mut self) -> std::result::Result<NixNum, NixType> {
-        self.pop_forced().expect_num()
-    }
-
-    #[inline(always)]
-    pub(crate) fn pop_forced_expect_bool(&mut self) -> std::result::Result<bool, NixType> {
-        self.pop_forced().expect_bool()
-    }
-
-    #[inline(always)]
-    pub(crate) fn try_force(
+    pub(crate) fn force_slot(
         &mut self,
         depth: usize,
         reader: &mut BytecodeReader<'_>,