From 68f459908fb587267813029c94138d794d26940b Mon Sep 17 00:00:00 2001
From: Roger-Luo <rogerluo.rl18@gmail.com>
Date: Fri, 30 Apr 2021 18:58:34 -0400
Subject: [PATCH] fix lhs rhs cmp

---
 src/tools.jl     | 2 +-
 test/runtests.jl | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tools.jl b/src/tools.jl
index 8120819..51d0d1e 100644
--- a/src/tools.jl
+++ b/src/tools.jl
@@ -64,7 +64,7 @@ end
 
 function cmp_exp(lhs, rhs)
     @switch (lhs, rhs) begin
-        @case (Neg(a::Token{:float64}), b::Token{:float64})
+        @case (Neg(a::Token{:float64}), b::Token{:float64}) || (b::Token{:float64}, Neg(a::Token{:float64}))
             startswith(b.str, '-') && a.str == b.str[2:end]
         @case _
             cmp_ast(lhs, rhs)
diff --git a/test/runtests.jl b/test/runtests.jl
index 2a53a31..ae234c1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -7,6 +7,7 @@ using Test
 
 @testset "cmp_exp" begin
     @test cmp_exp(Neg(qasm_f64(0.2)), qasm_f64(-0.2))
+    @test cmp_exp(qasm_f64(-0.2), Neg(qasm_f64(0.2)))
 end
 
 @testset "conversion" begin