expr: Remove the synthetic flag

Only diagnostics cares about this, and we can just check if the pointers
are equal.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/expr.h b/src/expr.h
index 22f569e..2de8958 100644
--- a/src/expr.h
+++ b/src/expr.h
@@ -110,8 +110,6 @@ struct bfs_expr {
 	bool always_true;
 	/** Whether this expression always evaluates to false. */
 	bool always_false;
-	/** Whether this expression doesn't appear on the command line. */
-	bool synthetic;
 
 	/** Estimated cost. */
 	float cost;