From b3cff6555f12a71dc70b7c85c5b125aa216f1153 Mon Sep 17 00:00:00 2001
From: Mark Thom <markjordanthom@gmail.com>
Date: Sat, 16 May 2020 23:10:38 -0600
Subject: [PATCH] propagate syntax errors from read_term when they're not
 UnexpectedEOF (#507)

---
 src/prolog/machine/machine_state.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/prolog/machine/machine_state.rs b/src/prolog/machine/machine_state.rs
index 6f6c5365..ad2dce34 100644
--- a/src/prolog/machine/machine_state.rs
+++ b/src/prolog/machine/machine_state.rs
@@ -730,13 +730,16 @@ impl MachineState {
                         if orig_stream.options.eof_action == EOFAction::Reset {
                             if self.fail == false {
                                 continue;
-                            } else {
-                                return Ok(());
                             }
                         }
+
+                        return Ok(());
                     }
 
-                    return Ok(());
+                    let stub = MachineError::functor_stub(clause_name!("read_term"), 3);
+                    let err = MachineError::syntax_error(self.heap.h(), err);
+
+                    return Err(self.error_form(err, stub));
                 }
             }
         }
-- 
2.54.0