[Podfile] Allow inhibit_all_warnings! in parent and child scopes

Closes #472

Author: amorde

CHANGELOG.md

@@ -11,8 +11,9 @@
 
 ##### Bug Fixes
 
-* None.  
-
+* Fix a crash when using `inhibit_all_warnings!` in parent and child scopes  
+  [Eric Amorde](https://github.com/amorde)
+  [#472](https://github.com/CocoaPods/Core/issues/472)
 
 ## 1.6.0.beta.2 (2018-10-17)
 

lib/cocoapods-core/podfile/target_definition.rb

@@ -893,6 +893,7 @@ def inhibit_warnings_hash
           if inhibit_hash['all']
             # Clean pods that are set to not inhibit inside parent if inhibit_all_warnings! was set.
             parent_hash['not_for_pods'] = nil
+            inhibit_hash.delete('all') if parent_hash['all']
           end
           parent_hash.merge(inhibit_hash) do |_, l, r|
             Array(l).concat(r).uniq

spec/podfile/dsl_spec.rb

@@ -205,6 +205,25 @@ module Pod
           target = podfile.target_definitions['InheritedLevelTwo']
           target.inhibits_warnings_for_pod?('PonyDebugger').should.be.true
         end
+
+        it 'allows inhibiting all warnings in parent and child scopes' do
+          podfile = Podfile.new do
+            inhibit_all_warnings!
+            target 'App' do
+              pod 'PonyDebugger'
+              inhibit_all_warnings!
+              target 'Inherited' do
+                inhibit_all_warnings!
+              end
+            end
+          end
+
+          target = podfile.target_definitions['App']
+          target.inhibits_warnings_for_pod?('PonyDebugger').should.be.true
+
+          target = podfile.target_definitions['Inherited']
+          target.inhibits_warnings_for_pod?('PonyDebugger').should.be.true
+        end
       end
 
       describe 'modular headers' do