Fix non-K"Identifier" leafs in export lists

src/runestone.jl

@@ -974,7 +974,7 @@ 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 $" || JuliaSyntax.is_operator(kid)
                 any_changes && push!(kids′, kid)
                 accept_node!(ctx, kid)
                 if kind(kid) === K"@"

test/runtests.jl

@@ -840,6 +840,8 @@ end
     @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")
+    # Non-identifiers
+    @test format_string("export  ^") == "export ^"
 end
 
 @testset "parsing new syntax" begin