diff --git a/src/library/compiler/extract_values.cpp b/src/library/compiler/extract_values.cpp
index 70a8fe4bde..9aaba8994f 100644
--- a/src/library/compiler/extract_values.cpp
+++ b/src/library/compiler/extract_values.cpp
@@ -25,7 +25,7 @@ class extract_values_fn : public compiler_step_visitor {
         if (it != m_cache.end())
             return it->second;
         name aux = mk_compiler_unused_name(env(), m_prefix, "_val", m_idx);
-        m_new_procs.push_back(procedure(aux, m_pos, e));
+        m_new_procs.push_back(procedure(aux, e));
         expr r   = mk_constant(aux);
         m_cache.insert(mk_pair(e, r));
         return r;
@@ -54,7 +54,6 @@ public:
 
     void operator()(procedure p) {
         m_root   = p.m_code;
-        m_pos    = p.m_pos;
         p.m_code = visit(p.m_code);
         m_new_procs.push_back(p);
     }
diff --git a/src/library/compiler/lambda_lifting.cpp b/src/library/compiler/lambda_lifting.cpp
index 0faffc73dd..adf113254f 100644
--- a/src/library/compiler/lambda_lifting.cpp
+++ b/src/library/compiler/lambda_lifting.cpp
@@ -117,7 +117,7 @@ class lambda_lifting_fn : public compiler_step_visitor {
         buffer<expr> locals;
         new_e = abstract_locals(new_e, locals);
         name aux_name = mk_compiler_unused_name(env(), m_prefix, "_lambda", m_idx);
-        m_new_procs.emplace_back(aux_name, get_pos_info(e), new_e);
+        m_new_procs.emplace_back(aux_name, new_e);
         return mk_rev_app(mk_constant(aux_name), locals);
     }
 
@@ -203,7 +203,7 @@ public:
         for (auto p : procs) {
             expr val     = p.m_code;
             expr new_val = is_lambda(val) ? visit_lambda_core(val) : visit(val);
-            m_new_procs.emplace_back(p.m_name, p.m_pos, new_val);
+            m_new_procs.emplace_back(p.m_name, new_val);
         }
         procs.clear();
         procs.append(m_new_procs);
diff --git a/src/library/compiler/preprocess.cpp b/src/library/compiler/preprocess.cpp
index a047b0636a..322ac74929 100644
--- a/src/library/compiler/preprocess.cpp
+++ b/src/library/compiler/preprocess.cpp
@@ -67,7 +67,7 @@ class preprocess_fn {
         }
         if (ctx.is_prop(type) || is_sort(type)) {
             expr r = locals.mk_lambda(mk_enf_neutral());
-            procs.emplace_back(d.get_name(), optional<pos_info>(), r);
+            procs.emplace_back(d.get_name(), r);
             return true;
         } else {
             return false;
@@ -138,7 +138,7 @@ public:
         m_env   = module::add(m_env, simp_decl, false);
         v       = erase_irrelevant(m_env, v);
         lean_trace(name({"compiler", "erase_irrelevant"}), tout() << "\n" << v << "\n";);
-        procs.emplace_back(n, optional<pos_info>(), v);
+        procs.emplace_back(n, v);
 
         lambda_lifting(m_env, m_cache, n, procs);
         lean_trace(name({"compiler", "lambda_lifting"}), tout() << "\n"; display(procs););
diff --git a/src/library/compiler/procedure.h b/src/library/compiler/procedure.h
index 4e090282f8..2d7075867b 100644
--- a/src/library/compiler/procedure.h
+++ b/src/library/compiler/procedure.h
@@ -9,9 +9,8 @@ Author: Leonardo de Moura
 namespace lean {
 struct procedure {
     name               m_name;
-    optional<pos_info> m_pos;
     expr               m_code;
-    procedure(name const & n, optional<pos_info> const & pos, expr const & code):
-        m_name(n), m_pos(pos), m_code(code) {}
+    procedure(name const & n, expr const & code):
+        m_name(n), m_code(code) {}
 };
 }
diff --git a/src/library/compiler/vm_compiler.cpp b/src/library/compiler/vm_compiler.cpp
index 3197248ee2..5593101079 100644
--- a/src/library/compiler/vm_compiler.cpp
+++ b/src/library/compiler/vm_compiler.cpp
@@ -353,7 +353,7 @@ static environment vm_compile(environment const & env, buffer<procedure> const &
         optimize(new_env, code);
         lean_trace(name({"compiler", "optimize_bytecode"}), tout() << " " << p.m_name << " " << arity << "\n";
                    display_vm_code(tout().get_stream(), code.size(), code.data()););
-        new_env = update_vm_code(new_env, p.m_name, code.size(), code.data(), args_info, p.m_pos);
+        new_env = update_vm_code(new_env, p.m_name, code.size(), code.data(), args_info);
     }
     return new_env;
 }
diff --git a/src/library/vm/vm.h b/src/library/vm/vm.h
index 7fe018d9e8..677474a958 100644
--- a/src/library/vm/vm.h
+++ b/src/library/vm/vm.h
@@ -929,7 +929,7 @@ unsigned get_num_nested_lambdas(expr const & e);
 /** \brief Add bytcode for the function named \c fn in \c env.
     \remark The index for \c fn must have been reserved using reserve_vm_index. */
 environment update_vm_code(environment const & env, name const & fn, unsigned code_sz, vm_instr const * code,
-                           list<vm_local_info> const & args_info, optional<pos_info> const & pos);
+                           list<vm_local_info> const & args_info, optional<pos_info> const & pos = optional<pos_info>());
 
 /** \brief Combines reserve_vm_index and update_vm_code */
 environment add_vm_code(environment const & env, name const & fn, expr const & e, unsigned code_sz, vm_instr const * code,