handle changes without a location

Author: MikeInnes

Manifest.toml

@@ -5,7 +5,7 @@ uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
 
 [[CSTParser]]
 deps = ["LibGit2", "Test", "Tokenize"]
-git-tree-sha1 = "82be55a328f39a11849569815a9f49911d6d7b58"
+git-tree-sha1 = "d878de3315f9b6569851d919f7976fe527d00c24"
 repo-rev = "location"
 repo-url = "https://github.com/MikeInnes/CSTParser.jl"
 uuid = "00ebfdb7-1f24-5e51-bd34-a7502290713f"

src/patch/cst.jl

@@ -59,6 +59,10 @@ end
 
 function replacement(src::SourceFile, p::Replace)
   loc = exprloc(src.ast, p.idx)
+  if loc == nothing
+    @warn "No location found for $(repr(CSTParser.striploc(expridx(src.ast, p.idx))))"
+    return
+  end
   prec = precedence_level(src.cst, loc)
   _, span = charrange(src.cst, loc)
   span => sprint(Base.show_unquoted, p.new, 0, prec)
@@ -90,7 +94,8 @@ function replacement(src::SourceFile, p::Delete)
   span => ""
 end
 
-replacement(src::SourceFile, p::Patch) = [replacement(src, p) for p in p.ps]
+replacement(src::SourceFile, p::Patch) =
+  filter(x -> x != nothing, [replacement(src, p) for p in p.ps])
 
 function patch(io::IO, src::SourceFile, rs)
   rs = sort(rs, by=x->first(x[1]))