YardMap ignores absolute paths (#678)

lib/solargraph/yard_map.rb

@@ -219,7 +219,7 @@ def process_gemsets
     def pins_for_require r, already_errored
       result = []
       begin
-        name = r.split('/').first
+        name = r.split('/').first.to_s
         return [] if name.empty? || @source_gems.include?(name) || @gem_paths.key?(name)
         spec = spec_for_require(name)
         @gem_paths[name] = spec.full_gem_path
@@ -282,7 +282,7 @@ def yardoc_file_for_spec spec
     # @param path [String]
     # @return [Gem::Specification]
     def spec_for_require path
-      name = path.split('/').first
+      name = path.split('/').first.to_s
       spec = Gem::Specification.find_by_name(name, @gemset[name])
 
       # Avoid loading the spec again if it's going to be skipped anyway

spec/yard_map_spec.rb

@@ -133,4 +133,14 @@
       expect(pin).to be
     end
   end
+
+  it 'ignores workspace requires starting with `/`' do
+    yard_map = Solargraph::YardMap.new
+    yard_map.change(['/'].to_set, "", [].to_set)
+  end
+
+  it 'ignores require references starting with `/`' do
+    yard_map = Solargraph::YardMap.new
+    yard_map.require_reference('/')
+  end
 end