# DEFINE: %{foo}=bar
# RUN: echo %{foo}
# DEFINE: %{foo}=bar
# RUN: echo %{foo}

#      CHECK: ValueError: Substitution whose pattern contains '%{foo}' is already defined before '{{DEFINE}}:' directive at line [[#@LINE-3]]
# CHECK-NEXT: Existing pattern: %{foo}
#  CHECK-NOT: Existing pattern:

# CHECK: Unresolved: 1 {{\([0-9]*.[0-9]*%\)}}