From 583f272aae7f64bb6262a438cdbe672f8da317f7 Mon Sep 17 00:00:00 2001
From: Christian Guinard <28689358+christiangnrd@users.noreply.github.com>
Date: Thu, 12 Sep 2024 09:07:02 -0300
Subject: [PATCH] Don't show string concatenation error hint to zero arg `+`

---
 base/errorshow.jl | 2 +-
 test/errorshow.jl | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/base/errorshow.jl b/base/errorshow.jl
index a3bf464439d44..d805cb64fb81e 100644
--- a/base/errorshow.jl
+++ b/base/errorshow.jl
@@ -1067,7 +1067,7 @@ Experimental.register_error_hint(nonsetable_type_hint_handler, MethodError)
 # (probably attempting concatenation)
 function string_concatenation_hint_handler(io, ex, arg_types, kwargs)
     @nospecialize
-    if (ex.f === +) && all(i -> i <: AbstractString, arg_types)
+    if (ex.f === +) && !isempty(arg_types) && all(i -> i <: AbstractString, arg_types)
         print(io, "\nString concatenation is performed with ")
         printstyled(io, "*", color=:cyan)
         print(io, " (See also: https://docs.julialang.org/en/v1/manual/strings/#man-concatenation).")
diff --git a/test/errorshow.jl b/test/errorshow.jl
index 80352ddeaa9cf..a82ab7743dc5a 100644
--- a/test/errorshow.jl
+++ b/test/errorshow.jl
@@ -1079,6 +1079,12 @@ let err_str
     @test occursin("String concatenation is performed with *", err_str)
 end
 
+# https://github.com/JuliaLang/julia/issues/55745
+let err_str
+    err_str = @except_str +() MethodError
+    @test !occursin("String concatenation is performed with *", err_str)
+end
+
 struct MissingLength; end
 struct MissingSize; end
 Base.IteratorSize(::Type{MissingSize}) = Base.HasShape{2}()