Report: empty location information in swift

[skyleaworlder]

> ./infer/bin/infer run --debug --biabduction --cfg-json cfg.json --tenv-json tenv.json
Logs in /Users/skyleaworlder/CodeProjects/infer/infer-out/logs
Capturing using JSON mode...
Found 2 source files to analyze in /Users/skyleaworlder/CodeProjects/infer/infer-out
2/2 [################################################################################] 100% 72.5ms

:0: error: Bad Footprint
  .

./tmp/demoAB.swift:0: error: Bad Footprint
  .

./tmp/demoAB.swift:0: error: Bad Footprint
  .

./tmp/demoAB.swift:18: error: Bad Footprint
  .


Found 4 issues
    Issue Type(ISSUED_TYPE_ID): #
  Bad Footprint(Bad_footprint): 4
Note: pruned 1 duplicate issues