Fix bug in formatting of export/public expressions with interpolated vars

src/runestone.jl

@@ -974,12 +974,15 @@ function spaces_in_export_public(ctx::Context, node::Node)
             state = :expect_identifier
         elseif state === :expect_identifier
             state = :expect_comma
-            if kind(kid) in KSet"Identifier @ MacroName"
+            if kind(kid) in KSet"Identifier @ MacroName $"
                 any_changes && push!(kids′, kid)
                 accept_node!(ctx, kid)
                 if kind(kid) === K"@"
                     state = :expect_identifier
                 end
+                if kind(kid) === K"$"
+                    @assert findlast(x -> x === K"quote", ctx.lineage_kinds) !== nothing
+                end
             else
                 @assert false
             end

test/runtests.jl

@@ -3,7 +3,7 @@
 using Runic:
     Runic, format_string
 using Test:
-    @test, @testset, @test_broken, @inferred
+    @test, @testset, @test_broken, @inferred, @test_throws
 using JuliaSyntax:
     JuliaSyntax
 
@@ -809,6 +809,10 @@ end
         @test format_string("$(verb) $(a)$(sp),\n$(b)") == "$(verb) $(a),\n    $(b)"
         @test format_string("$(verb) \n$(a)$(sp),\n$(b)") == "$(verb)\n    $(a),\n    $(b)"
     end
+    # Interpolated identifiers (currently only expected in K"quote")
+    @test format_string(":(export \$a)") == ":(export \$a)"
+    @test format_string("quote\nexport \$a, \$b\nend") == "quote\n    export \$a, \$b\nend"
+    @test_throws Exception format_string("export \$a")
 end
 
 @testset "parsing new syntax" begin