fix stream.rs UB

src/machine/arithmetic_ops.rs

@@ -1415,7 +1415,6 @@ mod tests {
     use crate::machine::mock_wam::*;
 
     #[test]
-    #[cfg_attr(miri, ignore = "blocked on streams.rs UB")]
     fn arith_eval_by_metacall_tests() {
         let mut wam = MachineState::new();
         let mut op_dir = default_op_dir();

src/machine/gc.rs

@@ -369,7 +369,6 @@ mod tests {
     use crate::machine::mock_wam::*;
 
     #[test]
-    #[cfg_attr(miri, ignore = "blocked on streams.rs UB")]
     fn heap_marking_tests() {
         let mut wam = MockWAM::new();
 

src/machine/mock_wam.rs

@@ -260,7 +260,6 @@ mod tests {
     use super::*;
 
     #[test]
-    #[cfg_attr(miri, ignore = "blocked on streams.rs UB")]
     fn unify_tests() {
         let mut wam = MachineState::new();
         let mut op_dir = default_op_dir();
@@ -482,7 +481,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg_attr(miri, ignore = "blocked on streams.rs UB")]
     fn test_unify_with_occurs_check() {
         let mut wam = MachineState::new();
         let mut op_dir = default_op_dir();