Add failing case to merge_imports test

Author: jrobsonchase

tests/source/merge_imports.rs

@@ -22,3 +22,6 @@ use a::{b::{c::*}};
 use a::{b::{c::{}}};
 use a::{b::{c::d}};
 use a::{b::{c::{xxx, yyy, zzz}}};
+
+use a::b;
+use a::b::c;

tests/target/merge_imports.rs

@@ -14,3 +14,6 @@ use foo::{a, b, c};
 pub use foo::{bar, foobar};
 
 use a::b::c::{d, xxx, yyy, zzz, *};
+
+use a::b;
+use a::b::c;