Removing Capture.degrade()

The provided `tests/builtin_ast_ondemand.tok` previously didn't work as expected.

src/compiler/ast.rs

@@ -1189,15 +1189,15 @@ fn traverse_node(compiler: &mut Compiler, node: &Dict) -> ImlOp {
                             "accept" => Op::LoadAccept.into(),
                             "break" => Op::LoadBreak.into(),
                             "exit" => Op::LoadExit.into(),
-                            "push" => Op::LoadPush.into(),
+                            "push" => Op::LoadPush.into(), // usecase?
                             _ => unreachable!(),
                         }
                     } else {
                         match parts[1] {
                             "accept" => Op::Accept.into(),
                             "break" => Op::Break.into(),
                             "exit" => Op::Exit.into(),
-                            "push" => Op::Push.into(),
+                            "push" => Op::Push.into(), // usecase?
                             _ => unreachable!(),
                         }
                     }

src/vm/capture.rs

@@ -71,17 +71,6 @@ impl Capture {
             _ => {}
         }
     }
-
-    // Degrades a capture to a severity to a capture with zero severity.
-    // This is done when a capture is read.
-    pub fn degrade(&mut self) {
-        match self {
-            Capture::Range(_, _, severity) | Capture::Value(_, _, severity) if *severity <= 5 => {
-                *severity = 0;
-            }
-            _ => {}
-        }
-    }
 }
 
 impl From<RefValue> for Capture {

src/vm/context.rs

@@ -189,7 +189,6 @@ impl<'program, 'reader, 'thread, 'parselet> Context<'program, 'reader, 'thread,
 
         let capture = &mut self.stack[pos];
 
-        capture.degrade(); // fixme: Can't extract do the degration?
         Some(capture.extract(&self.thread.reader))
     }
 
@@ -202,7 +201,6 @@ impl<'program, 'reader, 'thread, 'parselet> Context<'program, 'reader, 'thread,
             let capture = &mut self.stack[capture_start + i];
 
             if capture.alias(name) {
-                capture.degrade(); // fixme: Can't extract do the degration?
                 return Some(capture.extract(&self.thread.reader));
             }
         }

tests/builtin_ast_ondemand.tok

@@ -0,0 +1,15 @@
+Trilli : Int _  ast("int")
+
+Trollo : @{
+    Trilli+  if type($1) == "list" && $1.len > 1 ast("ints")
+}
+
+ast_print(Trollo)
+#---
+#1 2 3; 4
+#---
+#ints [start 1:1, end 1:6]
+# int [start 1:1, end 1:3] => 1
+# int [start 1:3, end 1:5] => 2
+# int [start 1:5, end 1:6] => 3
+#int [start 1:8, end 1:9] => 4