anchor.diff:  
   [source,java]
   ----
  -Span initialSpan = this.tracer.nextSpan().name("span").start();
  -ExtraFieldPropagation.set(initialSpan.context(), "foo", "bar");
  -ExtraFieldPropagation.set(initialSpan.context(), "UPPER_CASE", "someValue");
  +Unresolved directive in intro.adoc - include::{project-root}/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/multiple/MultipleHopsIntegrationTests.java[tags=baggage,indent=0]
   ----
   
   ===== Baggage versus Span Tags
  
positive.code: .The setup
  [source,yml]
  ----
  spring.sleuth:
    baggage-keys:
      - baz
      - bizarrecase
    propagation-keys:
      - foo
      - upper_case
  ----
  
  .The code
  [source,java]
  ----
  initialSpan.tag("foo",
  		ExtraFieldPropagation.get(initialSpan.context(), "foo"));
  initialSpan.tag("UPPER_CASE",
  		ExtraFieldPropagation.get(initialSpan.context(), "UPPER_CASE"));
  ----
  
  [[sleuth-adding-project]]
  
negative.code: 
  [source,java]
  ----
  Unresolved directive in intro.adoc - include::{project-root}/spring-cloud-sleuth-zipkin/src/test/java/org/springframework/cloud/sleuth/zipkin2/ZipkinAutoConfigurationTests.java[tags=override_default_beans,indent=0]
  ----
  
  == Additional Resources
  