show: print var"ccall" correctly

Author: aviatesk

base/show.jl

@@ -1779,10 +1779,10 @@ function show_enclosed_list(io::IO, op, items, sep, cl, indent, prec=0, quote_le
 end
 
 const keyword_syms = Set([
-    :baremodule, :begin, :break, :catch, :const, :continue, :do, :else, :elseif,
+    :baremodule, :begin, :break, :catch, :ccall, :const, :continue, :do, :else, :elseif,
     :end, :export, :var"false", :finally, :for, :function, :global, :if, :import,
     :let, :local, :macro, :module, :public, :quote, :return, :struct, :var"true",
-    :try, :using, :while ])
+    :try, :using, :while])
 
 function is_valid_identifier(sym)
     return (isidentifier(sym) && !(sym in keyword_syms)) ||

test/show.jl

@@ -2876,6 +2876,7 @@ end
 # Issue 56936
 @testset "code printing of var\"keyword\" identifiers" begin
     @test_repr """:(var"do" = 1)"""
+    @test_repl """:(var"ccall" = 1)"""
     @weak_test_repr """:(let var"let" = 1; var"let"; end)"""
 end