Fix a bug with newline instead of space after `where`.

src/runestone.jl

@@ -839,8 +839,12 @@ function spaces_around_keywords(ctx::Context, node::Node)
                 any_changes && push!(kids′, kid)
             end
         elseif state === :looking_for_space
-            if kind(kid) === K"Whitespace" && span(kid) == 1
+            if (kind(kid) === K"Whitespace" && span(kid) == 1) ||
-                # TODO: Include NewlineWs here?
+                    kind(kid) === K"NewlineWs"
+                if kind(kid) === K"NewlineWs"
+                    # Is a newline instead of a space accepted for any other case?
+                    @assert kind(node) === K"where"
+                end
                 accept_node!(ctx, kid)
                 any_changes && push!(kids′, kid)
             elseif kind(kid) === K"Whitespace"

test/runtests.jl

@@ -359,6 +359,8 @@ end
         @test format_string("A$(sp)where$(sp){T}$(sp)where$(sp){S}") == "A where {T} where {S}"
         @test format_string("f()$(sp)do$(sp)x\ny\nend") == "f() do x\n    y\nend"
         @test format_string("f()$(sp)do\ny\nend") == "f() do\n    y\nend"
+        # After `where` (anywhere else?) a newline can be used instead of a space
+        @test format_string("A$(sp)where$(sp)\n{A}") == "A where\n{A}"
     end
     @test format_string("try\nerror()\ncatch\nend") == "try\n    error()\ncatch\nend"
     @test format_string("A where{T}") == "A where {T}"