Merge pull request #2281 from bakaq/miri

Initial Miri support

src/heap_iter.rs

@@ -686,6 +686,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(miri, ignore = "it takes too long to run")]
     fn heap_stackless_iter_tests() {
         let mut wam = MockWAM::new();
 
@@ -1757,6 +1758,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(miri, ignore = "blocked on atom_table.rs UB")]
     fn heap_stackful_iter_tests() {
         let mut wam = MockWAM::new();
 
@@ -2349,6 +2351,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(miri, ignore = "blocked on atom_table.rs UB")]
     fn heap_stackful_post_order_iter() {
         let mut wam = MockWAM::new();
 
@@ -2832,6 +2835,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(miri, ignore = "blocked on atom_table.rs UB")]
     fn heap_stackless_post_order_iter() {
         let mut wam = MockWAM::new();