Don't run tests (etc) if the build fails

ruby/lib/helix_runtime/build_task.rb

@@ -52,7 +52,7 @@ module HelixRuntime
       end
 
       task "cargo:build" => ["helix:pre_build", "helix:check_path"] do
-        project.cargo_build
+        project.cargo_build || abort
       end
 
       task "cargo:clean" do
@@ -61,7 +61,7 @@ module HelixRuntime
 
       desc "Build #{project.name}"
       task :build => ["helix:pre_build", "helix:check_path"] do
-        project.build
+        project.build || abort
       end
 
       desc "Remove build artifacts"

ruby/lib/helix_runtime/project.rb

@@ -117,11 +117,11 @@ module HelixRuntime
       raise "native source doesn't exist, run `cargo_build` first; source=#{source}" unless File.exist?(source)
       FileUtils.mkdir_p(File.dirname(native_path))
       FileUtils.cp source, native_path
+      true
     end
 
     def build
-      cargo_build
-      copy_native
+      cargo_build && copy_native
     end
 
     def clobber