diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8d3494e42..20e9bfdcf 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -25,7 +25,7 @@ endif()
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
 
 # Initialize CXXFLAGS.
-set(CMAKE_CXX_FLAGS                "-Wall -std=c++11 ${LEAN_EXTRA_CXX_FLAGS}")
+set(CMAKE_CXX_FLAGS                "-Wall -Wunused-parameter -std=c++11 ${LEAN_EXTRA_CXX_FLAGS}")
 set(CMAKE_CXX_FLAGS_DEBUG          "-g -DLEAN_DEBUG -DLEAN_TRACE")
 set(CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE        "-O3 -DNDEBUG")
diff --git a/src/frontends/lean/elaborator.cpp b/src/frontends/lean/elaborator.cpp
index c81183d38..4a272164a 100644
--- a/src/frontends/lean/elaborator.cpp
+++ b/src/frontends/lean/elaborator.cpp
@@ -502,7 +502,7 @@ class elaborator::imp {
     struct cycle_detected {};
     void occ_core(expr const & t) {
         check_interrupted(m_interrupted);
-        auto proc = [&](expr const & e, unsigned offset) {
+        auto proc = [&](expr const & e, unsigned) {
             if (is_metavar(e)) {
                 unsigned midx = metavar_idx(e);
                 if (m_metavars[midx].m_mark)
@@ -741,7 +741,7 @@ class elaborator::imp {
 
     struct found_assigned {};
     bool has_assigned_metavar(expr const & e) {
-        auto proc = [&](expr const & n, unsigned offset) {
+        auto proc = [&](expr const & n, unsigned) {
             if (is_metavar(n)) {
                 unsigned midx = metavar_idx(n);
                 if (m_metavars[midx].m_assignment)
@@ -758,7 +758,7 @@ class elaborator::imp {
     }
 
     expr instantiate(expr const & e) {
-        auto proc = [&](expr const & n, unsigned offset) -> expr {
+        auto proc = [&](expr const & n, unsigned) -> expr {
             if (is_metavar(n)) {
                 expr const & m = n;
                 unsigned midx = metavar_idx(m);
diff --git a/src/frontends/lean/frontend.cpp b/src/frontends/lean/frontend.cpp
index ddcc9e2eb..c97a7d225 100644
--- a/src/frontends/lean/frontend.cpp
+++ b/src/frontends/lean/frontend.cpp
@@ -347,7 +347,7 @@ struct frontend::imp {
         m_state.set_interrupt(flag);
     }
 
-    imp(frontend & fe):
+    imp(frontend &):
         m_num_children(0) {
     }
 
diff --git a/src/frontends/lean/parser.cpp b/src/frontends/lean/parser.cpp
index baa66f9a0..0a410476f 100644
--- a/src/frontends/lean/parser.cpp
+++ b/src/frontends/lean/parser.cpp
@@ -704,7 +704,7 @@ class parser::imp {
         \remark If \c suppress_type is true, then the type doesn't
         need to be provided. That is, we automatically include a placeholder.
     */
-    void parse_simple_bindings(bindings_buffer & result, bool implicit_decl, bool supress_type) {
+    void parse_simple_bindings(bindings_buffer & result, bool implicit_decl, bool suppress_type) {
         buffer<std::pair<pos_info, name>> names;
         parse_names(names);
         expr type;
diff --git a/src/frontends/lean/pp.cpp b/src/frontends/lean/pp.cpp
index e4d461915..b034051d5 100644
--- a/src/frontends/lean/pp.cpp
+++ b/src/frontends/lean/pp.cpp
@@ -1106,7 +1106,7 @@ class pp_fn {
 
     struct found_prefix {};
     bool uses_prefix(expr const & e, name const & prefix) {
-        auto f = [&](expr const & e, unsigned offset) {
+        auto f = [&](expr const & e, unsigned) {
             if (is_constant(e)) {
                 if (is_prefix_of(prefix, const_name(e))) throw found_prefix();
             } else if (is_abstraction(e)) {
@@ -1274,7 +1274,7 @@ class pp_formatter_cell : public formatter_cell {
         return r;
     }
 
-    format pp_builtin_set(object const & obj, options const & opts) {
+    format pp_builtin_set(object const & obj, options const &) {
         char const * kwd = obj.keyword();
         name const & n = obj.get_name();
         return format{highlight_command(format(kwd)), space(), format(n)};
diff --git a/src/kernel/expr.cpp b/src/kernel/expr.cpp
index 5594d7c66..030429dfb 100644
--- a/src/kernel/expr.cpp
+++ b/src/kernel/expr.cpp
@@ -108,7 +108,7 @@ expr_let::expr_let(name const & n, expr const & t, expr const & v, expr const &
 }
 expr_let::~expr_let() {}
 name value::get_unicode_name() const { return get_name(); }
-bool value::normalize(unsigned num_args, expr const * args, expr & r) const { return false; }
+bool value::normalize(unsigned, expr const *, expr &) const { return false; }
 void value::display(std::ostream & out) const { out << get_name(); }
 bool value::operator==(value const & other) const { return typeid(*this) == typeid(other); }
 format value::pp() const { return format(get_name()); }
diff --git a/src/kernel/metavar.cpp b/src/kernel/metavar.cpp
index f75109589..5d7dada1a 100644
--- a/src/kernel/metavar.cpp
+++ b/src/kernel/metavar.cpp
@@ -129,7 +129,7 @@ expr instantiate_metavars(expr const & e, metavar_env const & env) {
     if (!has_metavar(e)) {
         return e;
     } else {
-        auto f = [=](expr const & m, unsigned offset) -> expr {
+        auto f = [=](expr const & m, unsigned) -> expr {
             if (is_metavar(m) && env.contains(m)) {
                 expr s = env.get_subst(m);
                 return s ? s : m;
@@ -195,7 +195,7 @@ bool has_assigned_metavar(expr const & e, metavar_env const & menv) {
     if (!has_metavar(e)) {
         return false;
     } else {
-        auto proc = [&](expr const & n, unsigned offset) {
+        auto proc = [&](expr const & n, unsigned) {
             if (is_metavar(n) && menv.contains(n) && menv.is_assigned(n))
                 throw found_assigned();
         };
@@ -216,7 +216,7 @@ bool has_assigned_metavar(expr const & e, metavar_env const & menv) {
 struct found_metavar {};
 
 bool has_metavar(expr const & e, unsigned midx, metavar_env const & menv) {
-    auto f = [&](expr const & m, unsigned offset) {
+    auto f = [&](expr const & m, unsigned) {
         if (is_metavar(m)) {
             unsigned midx2 = metavar_idx(m);
             if (midx2 == midx)
diff --git a/src/kernel/object.h b/src/kernel/object.h
index f54e5fcd3..2f1bf205c 100644
--- a/src/kernel/object.h
+++ b/src/kernel/object.h
@@ -61,7 +61,7 @@ public:
     virtual bool is_theorem() const { return false; }
     virtual bool is_var_decl() const { return false; }
 
-    virtual bool in_builtin_set(expr const & v) const { return false; }
+    virtual bool in_builtin_set(expr const &) const { return false; }
 };
 
 /**
diff --git a/src/kernel/occurs.cpp b/src/kernel/occurs.cpp
index 96b3ddb7c..fd6a2a8cd 100644
--- a/src/kernel/occurs.cpp
+++ b/src/kernel/occurs.cpp
@@ -27,7 +27,7 @@ namespace occurs_ns {
 struct found {};
 }
 bool occurs(name const & n, context const * c, unsigned sz, expr const * es) {
-    auto visitor = [&](expr const & e, unsigned offset) -> void {
+    auto visitor = [&](expr const & e, unsigned) -> void {
         if (is_constant(e)) {
             if (const_name(e) == n)
                 throw occurs_ns::found();
@@ -42,7 +42,7 @@ bool occurs(name const & n, context const * c, unsigned sz, expr const * es) {
 }
 
 bool occurs(expr const & n, context const * c, unsigned sz, expr const * es) {
-    auto visitor = [&](expr const & e, unsigned offset) -> void {
+    auto visitor = [&](expr const & e, unsigned) -> void {
         if (e == n)
             throw occurs_ns::found();
     };
diff --git a/src/kernel/replace.h b/src/kernel/replace.h
index 6d0bfe684..1b866a126 100644
--- a/src/kernel/replace.h
+++ b/src/kernel/replace.h
@@ -16,7 +16,7 @@ namespace lean {
 */
 class default_replace_postprocessor {
 public:
-    void operator()(expr const & old_e, expr const & new_e) {}
+    void operator()(expr const &, expr const &) {}
 };
 
 /**
diff --git a/src/library/arith/int.cpp b/src/library/arith/int.cpp
index 909fc561a..780ef3ed8 100644
--- a/src/library/arith/int.cpp
+++ b/src/library/arith/int.cpp
@@ -34,7 +34,7 @@ public:
     }
     virtual void display(std::ostream & out) const { out << m_val; }
     virtual format pp() const { return format(m_val); }
-    virtual format pp(bool unicode) const { return pp(); }
+    virtual format pp(bool ) const { return pp(); }
     virtual unsigned hash() const { return m_val.hash(); }
     mpz const & get_num() const { return m_val; }
 };
diff --git a/src/library/arith/nat.cpp b/src/library/arith/nat.cpp
index 10675fd86..535b49ea3 100644
--- a/src/library/arith/nat.cpp
+++ b/src/library/arith/nat.cpp
@@ -33,7 +33,7 @@ public:
     }
     virtual void display(std::ostream & out) const { out << m_val; }
     virtual format pp() const { return format(m_val); }
-    virtual format pp(bool unicode) const { return pp(); }
+    virtual format pp(bool ) const { return pp(); }
     virtual unsigned hash() const { return m_val.hash(); }
     mpz const & get_num() const { return m_val; }
 };
diff --git a/src/library/arith/real.cpp b/src/library/arith/real.cpp
index 96b56d765..76c6e81d7 100644
--- a/src/library/arith/real.cpp
+++ b/src/library/arith/real.cpp
@@ -37,7 +37,7 @@ public:
     }
     virtual void display(std::ostream & out) const { out << m_val; }
     virtual format pp() const { return format(m_val); }
-    virtual format pp(bool unicode) const { return pp(); }
+    virtual format pp(bool ) const { return pp(); }
     virtual unsigned hash() const { return m_val.hash(); }
     mpq const & get_num() const { return m_val; }
 };
diff --git a/src/library/formatter.cpp b/src/library/formatter.cpp
index 975d728e4..d8559ce60 100644
--- a/src/library/formatter.cpp
+++ b/src/library/formatter.cpp
@@ -12,23 +12,23 @@ Author: Leonardo de Moura
 namespace lean {
 class simple_formatter_cell : public formatter_cell {
 public:
-    virtual format operator()(expr const & e, options const & opts) {
+    virtual format operator()(expr const & e, options const &) {
         std::ostringstream s; s << e; return format(s.str());
     }
-    virtual format operator()(context const & c, options const & opts) {
+    virtual format operator()(context const & c, options const &) {
         std::ostringstream s; s << c; return format(s.str());
     }
-    virtual format operator()(context const & c, expr const & e, bool format_ctx, options const & opts) {
+    virtual format operator()(context const & c, expr const & e, bool format_ctx, options const &) {
         std::ostringstream s;
         if (format_ctx)
             s << c << "|-\n";
         s << mk_pair(e, c);
         return format(s.str());
     }
-    virtual format operator()(object const & obj, options const & opts) {
+    virtual format operator()(object const & obj, options const &) {
         std::ostringstream s; s << obj; return format(s.str());
     }
-    virtual format operator()(environment const & env, options const & opts) {
+    virtual format operator()(environment const & env, options const &) {
         std::ostringstream s; s << env; return format(s.str());
     }
 };
diff --git a/src/library/formatter.h b/src/library/formatter.h
index 357e431dc..2a8c34251 100644
--- a/src/library/formatter.h
+++ b/src/library/formatter.h
@@ -35,7 +35,7 @@ public:
     /** \brief Format the given environment */
     virtual format operator()(environment const & env, options const & opts) = 0;
     /** \brief Request interruption */
-    virtual void set_interrupt(bool flag) {}
+    virtual void set_interrupt(bool ) {}
 };
 /**
    \brief Smart-pointer for the actual formatter object (aka \c formatter_cell).
diff --git a/src/library/ho_unifier.cpp b/src/library/ho_unifier.cpp
index 038cbfb4c..d47878715 100644
--- a/src/library/ho_unifier.cpp
+++ b/src/library/ho_unifier.cpp
@@ -285,7 +285,7 @@ class ho_unifier::imp {
     }
 
     /** \brief Creates a subproblem based on the application arguments */
-    bool process_app_args(context const & ctx, expr const & a, expr const & b, unsigned start) {
+    bool process_app_args(context const & ctx, expr const & a, expr const & b, unsigned) {
         lean_assert(is_app(a) && is_app(b));
         if (num_args(a) != num_args(b)) {
             return false;
@@ -328,9 +328,9 @@ class ho_unifier::imp {
         bool m_failed;
     public:
         unification_problems_wrapper():m_failed(false) {}
-        virtual void add_eq(context const & ctx, expr const & lhs, expr const & rhs) { m_failed = true; }
-        virtual void add_type_of_eq(context const & ctx, expr const & n, expr const & t) { m_failed = true; }
-        virtual void add_is_convertible(context const & ctx, expr const & t1, expr const & t2) { m_failed = true; }
+        virtual void add_eq(context const &, expr const &, expr const &) { m_failed = true; }
+        virtual void add_type_of_eq(context const &, expr const &, expr const &) { m_failed = true; }
+        virtual void add_is_convertible(context const &, expr const &, expr const &) { m_failed = true; }
         bool failed() const { return m_failed; }
     };
 
diff --git a/src/library/kernel_exception_formatter.cpp b/src/library/kernel_exception_formatter.cpp
index 5c198608e..2c02619e9 100644
--- a/src/library/kernel_exception_formatter.cpp
+++ b/src/library/kernel_exception_formatter.cpp
@@ -30,11 +30,11 @@ format pp(formatter const & fmt, kernel_exception const & ex, options const & op
         return format(ex.what());
 }
 
-format pp(unknown_name_exception const & ex, options const & opts) {
+format pp(unknown_name_exception const & ex, options const &) {
     return format{format("unknown object '"), format(ex.get_name()), format("'")};
 }
 
-format pp(already_declared_exception const & ex, options const & opts) {
+format pp(already_declared_exception const & ex, options const &) {
     return format{format("invalid object declaration, environment already has an object named '"), format(ex.get_name()), format("'")};
 }
 
diff --git a/src/library/placeholder.cpp b/src/library/placeholder.cpp
index dc63673ab..0201680a4 100644
--- a/src/library/placeholder.cpp
+++ b/src/library/placeholder.cpp
@@ -26,7 +26,7 @@ bool has_placeholder(expr const & e) {
 }
 
 expr replace_placeholders_with_metavars(expr const & e, metavar_env & menv, expr_map<expr> * trace) {
-    auto f = [&](expr const & e, context const & ctx, unsigned offset) -> expr {
+    auto f = [&](expr const & e, context const & ctx, unsigned) -> expr {
         if (is_placeholder(e)) {
             return menv.mk_metavar(ctx);
         } else {
diff --git a/src/library/printer.cpp b/src/library/printer.cpp
index 9d0a4336e..6fa0bffbd 100644
--- a/src/library/printer.cpp
+++ b/src/library/printer.cpp
@@ -75,7 +75,7 @@ struct print_expr_fn {
             return print_child(a, c);
     }
 
-    void print_metavar(expr const & a, context const & c) {
+    void print_metavar(expr const & a, context const &) {
         out() << "?M" << metavar_idx(a);
         if (metavar_ctx(a)) {
             out() << "[";
diff --git a/src/library/reduce.cpp b/src/library/reduce.cpp
index 343e0d5a7..4eda5bcd3 100644
--- a/src/library/reduce.cpp
+++ b/src/library/reduce.cpp
@@ -45,7 +45,7 @@ expr head_beta_reduce(expr const & t) {
 }
 
 expr beta_reduce(expr t) {
-    auto f = [=](expr const & m, unsigned offset) -> expr {
+    auto f = [=](expr const & m, unsigned) -> expr {
         if (is_head_beta(m))
             return head_beta_reduce(m);
         else
diff --git a/src/shell/lean.cpp b/src/shell/lean.cpp
index fcafa8bd4..0ffb7e9f8 100644
--- a/src/shell/lean.cpp
+++ b/src/shell/lean.cpp
@@ -20,7 +20,7 @@ using lean::parser;
 
 static interruptable_ptr<shell> g_lean_shell;
 
-static void on_ctrl_c(int i) {
+static void on_ctrl_c(int ) {
     g_lean_shell.set_interrupt(true);
 }
 
diff --git a/src/util/debug.cpp b/src/util/debug.cpp
index 2632db692..958736dc4 100644
--- a/src/util/debug.cpp
+++ b/src/util/debug.cpp
@@ -90,7 +90,6 @@ void invoke_debugger() {
             } else {
                 std::cerr << "ERROR STARTING GDB...\n";
                 // forcing seg fault.
-                int * x = 0;
                 *x = 0;
             }
             return;
diff --git a/src/util/interval/interval.h b/src/util/interval/interval.h
index eef79c82d..b32683d32 100644
--- a/src/util/interval/interval.h
+++ b/src/util/interval/interval.h
@@ -321,7 +321,7 @@ public:
 
     friend interval<T> cosh (interval<T> o) { o.cosh();  return o; }
     friend interval<T> cosh (interval<T> o, interval_deps & deps) { o.cosh(deps);  return o; }
-    friend interval<T> cosh_jst(interval<T> o, interval_deps & deps) { o.cosh();  return o; }
+    friend interval<T> cosh_jst(interval<T> o, interval_deps & deps) { o.cosh_jst(deps);  return o; }
 
     friend interval<T> tanh (interval<T> o) { o.tanh();  return o; }
     friend interval<T> tanh (interval<T> o, interval_deps & deps) { o.tanh(deps);  return o; }
diff --git a/src/util/numerics/mpbq.h b/src/util/numerics/mpbq.h
index 4507112ad..64fb1ab68 100644
--- a/src/util/numerics/mpbq.h
+++ b/src/util/numerics/mpbq.h
@@ -280,27 +280,27 @@ public:
     static void power(mpbq & v, unsigned k) { _power(v, v, k); }
 
     // Transcendental functions
-    static void exp(mpbq & v)   { lean_unreachable(); }
-    static void exp2(mpbq & v)  { lean_unreachable(); }
-    static void exp10(mpbq & v) { lean_unreachable(); }
-    static void log(mpbq & v)   { lean_unreachable(); }
-    static void log2(mpbq & v)  { lean_unreachable(); }
-    static void log10(mpbq & v) { lean_unreachable(); }
-    static void sin(mpbq & v)   { lean_unreachable(); }
-    static void cos(mpbq & v)   { lean_unreachable(); }
-    static void tan(mpbq & v)   { lean_unreachable(); }
-    static void sec(mpbq & v)   { lean_unreachable(); }
-    static void csc(mpbq & v)   { lean_unreachable(); }
-    static void cot(mpbq & v)   { lean_unreachable(); }
-    static void asin(mpbq & v)  { lean_unreachable(); }
-    static void acos(mpbq & v)  { lean_unreachable(); }
-    static void atan(mpbq & v)  { lean_unreachable(); }
-    static void sinh(mpbq & v)  { lean_unreachable(); }
-    static void cosh(mpbq & v)  { lean_unreachable(); }
-    static void tanh(mpbq & v)  { lean_unreachable(); }
-    static void asinh(mpbq & v) { lean_unreachable(); }
-    static void acosh(mpbq & v) { lean_unreachable(); }
-    static void atanh(mpbq & v) { lean_unreachable(); }
+    static void exp(mpbq & )   { lean_unreachable(); }
+    static void exp2(mpbq & )  { lean_unreachable(); }
+    static void exp10(mpbq & ) { lean_unreachable(); }
+    static void log(mpbq & )   { lean_unreachable(); }
+    static void log2(mpbq & )  { lean_unreachable(); }
+    static void log10(mpbq & ) { lean_unreachable(); }
+    static void sin(mpbq & )   { lean_unreachable(); }
+    static void cos(mpbq & )   { lean_unreachable(); }
+    static void tan(mpbq & )   { lean_unreachable(); }
+    static void sec(mpbq & )   { lean_unreachable(); }
+    static void csc(mpbq & )   { lean_unreachable(); }
+    static void cot(mpbq & )   { lean_unreachable(); }
+    static void asin(mpbq & )  { lean_unreachable(); }
+    static void acos(mpbq & )  { lean_unreachable(); }
+    static void atan(mpbq & )  { lean_unreachable(); }
+    static void sinh(mpbq & )  { lean_unreachable(); }
+    static void cosh(mpbq & )  { lean_unreachable(); }
+    static void tanh(mpbq & )  { lean_unreachable(); }
+    static void asinh(mpbq & ) { lean_unreachable(); }
+    static void acosh(mpbq & ) { lean_unreachable(); }
+    static void atanh(mpbq & ) { lean_unreachable(); }
 };
 
 }
diff --git a/src/util/numerics/mpfp.h b/src/util/numerics/mpfp.h
index 04e321b17..9a72b09d9 100644
--- a/src/util/numerics/mpfp.h
+++ b/src/util/numerics/mpfp.h
@@ -33,37 +33,37 @@ public:
 
     // Setter functions
     mpfp & set(mpfp const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set(m_val, v.m_val, MPFR_RNDN); return *this;
+        mpfr_set(m_val, v.m_val, rnd); return *this;
     }
     mpfp & set(unsigned long int const v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_ui(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_ui(m_val, v, rnd); return *this;
     }
     mpfp & set(long int const v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_si(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_si(m_val, v, rnd); return *this;
     }
     mpfp & set(float const v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_flt(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_flt(m_val, v, rnd); return *this;
     }
     mpfp & set(double const v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_d(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_d(m_val, v, rnd); return *this;
     }
     mpfp & set(long double const v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_ld(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_ld(m_val, v, rnd); return *this;
     }
     mpfp & set(mpz_t const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_z(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_z(m_val, v, rnd); return *this;
     }
     mpfp & set(mpq_t const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_q(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_q(m_val, v, rnd); return *this;
     }
     mpfp & set(mpf_t const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_f(m_val, v, MPFR_RNDN); return *this;
+        mpfr_set_f(m_val, v, rnd); return *this;
     }
     mpfp & set(mpz   const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_z(m_val, v.m_val, MPFR_RNDN); return *this;
+        mpfr_set_z(m_val, v.m_val, rnd); return *this;
     }
     mpfp & set(mpq   const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
-        mpfr_set_q(m_val, v.m_val, MPFR_RNDN); return *this;
+        mpfr_set_q(m_val, v.m_val, rnd); return *this;
     }
     mpfp & set(mpbq  const & v, mpfr_rnd_t rnd = MPFR_RNDN) {
         mpfr_set_z(m_val, v.m_num.m_val, rnd);   // this = m_num
diff --git a/src/util/numerics/mpq.h b/src/util/numerics/mpq.h
index c8c10f7a3..d87692324 100644
--- a/src/util/numerics/mpq.h
+++ b/src/util/numerics/mpq.h
@@ -227,7 +227,7 @@ public:
     static bool is_zero(mpq const &  v) { return v.is_zero(); }
     static bool is_pos(mpq const & v) { return v.is_pos(); }
     static bool is_neg(mpq const & v) { return v.is_neg(); }
-    static void set_rounding(bool plus_inf) {}
+    static void set_rounding(bool ) {}
     static void neg(mpq & v) { v.neg(); }
     static void inv(mpq & v) { v.inv(); }
     static void reset(mpq & v) { v = 0; }
@@ -252,27 +252,27 @@ public:
     static inline mpq pi_twice_upper() { return pi_u * 2; }
 
     // Transcendental functions
-    static void exp(mpq & v)   { lean_unreachable(); }
-    static void exp2(mpq & v)  { lean_unreachable(); }
-    static void exp10(mpq & v) { lean_unreachable(); }
-    static void log(mpq & v)   { lean_unreachable(); }
-    static void log2(mpq & v)  { lean_unreachable(); }
-    static void log10(mpq & v) { lean_unreachable(); }
-    static void sin(mpq & v)   { lean_unreachable(); }
-    static void cos(mpq & v)   { lean_unreachable(); }
-    static void tan(mpq & v)   { lean_unreachable(); }
-    static void sec(mpq & v)   { lean_unreachable(); }
-    static void csc(mpq & v)   { lean_unreachable(); }
-    static void cot(mpq & v)   { lean_unreachable(); }
-    static void asin(mpq & v)  { lean_unreachable(); }
-    static void acos(mpq & v)  { lean_unreachable(); }
-    static void atan(mpq & v)  { lean_unreachable(); }
-    static void sinh(mpq & v)  { lean_unreachable(); }
-    static void cosh(mpq & v)  { lean_unreachable(); }
-    static void tanh(mpq & v)  { lean_unreachable(); }
-    static void asinh(mpq & v) { lean_unreachable(); }
-    static void acosh(mpq & v) { lean_unreachable(); }
-    static void atanh(mpq & v) { lean_unreachable(); }
+    static void exp(mpq & )   { lean_unreachable(); }
+    static void exp2(mpq & )  { lean_unreachable(); }
+    static void exp10(mpq & ) { lean_unreachable(); }
+    static void log(mpq & )   { lean_unreachable(); }
+    static void log2(mpq & )  { lean_unreachable(); }
+    static void log10(mpq & ) { lean_unreachable(); }
+    static void sin(mpq & )   { lean_unreachable(); }
+    static void cos(mpq & )   { lean_unreachable(); }
+    static void tan(mpq & )   { lean_unreachable(); }
+    static void sec(mpq & )   { lean_unreachable(); }
+    static void csc(mpq & )   { lean_unreachable(); }
+    static void cot(mpq & )   { lean_unreachable(); }
+    static void asin(mpq & )  { lean_unreachable(); }
+    static void acos(mpq & )  { lean_unreachable(); }
+    static void atan(mpq & )  { lean_unreachable(); }
+    static void sinh(mpq & )  { lean_unreachable(); }
+    static void cosh(mpq & )  { lean_unreachable(); }
+    static void tanh(mpq & )  { lean_unreachable(); }
+    static void asinh(mpq & ) { lean_unreachable(); }
+    static void acosh(mpq & ) { lean_unreachable(); }
+    static void atanh(mpq & ) { lean_unreachable(); }
 };
 
 }
diff --git a/src/util/numerics/mpz.h b/src/util/numerics/mpz.h
index 8cfd2bc46..e9fe1b347 100644
--- a/src/util/numerics/mpz.h
+++ b/src/util/numerics/mpz.h
@@ -227,7 +227,7 @@ public:
     static bool is_zero(mpz const & v) { return v.is_zero(); }
     static bool is_pos(mpz const & v) { return v.is_pos(); }
     static bool is_neg(mpz const & v) { return v.is_neg(); }
-    static void set_rounding(bool plus_inf) {}
+    static void set_rounding(bool ) {}
     static void neg(mpz & v) { v.neg(); }
     static void reset(mpz & v) { v = 0; }
     // v <- v^k