From db0b126d160a5cdeeefb80512ff7f506c698200d Mon Sep 17 00:00:00 2001
From: Samuel Badr <samuel.badr@gmail.com>
Date: Fri, 5 May 2023 02:16:10 +0200
Subject: [PATCH] Allow showing of StepRangLen{T} with generic T (#49516)

(cherry picked from commit ee958432e043d82975ddc02fe670f56d49b25c57)
---
 base/range.jl  |  2 +-
 test/ranges.jl | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/base/range.jl b/base/range.jl
index 9d12ae1001784f..a2803c2cf6a560 100644
--- a/base/range.jl
+++ b/base/range.jl
@@ -1093,7 +1093,7 @@ show(io::IO, r::AbstractRange) = print(io, repr(first(r)), ':', repr(step(r)), '
 show(io::IO, r::UnitRange) = print(io, repr(first(r)), ':', repr(last(r)))
 show(io::IO, r::OneTo) = print(io, "Base.OneTo(", r.stop, ")")
 function show(io::IO, r::StepRangeLen)
-    if step(r) != 0
+    if !iszero(step(r))
         print(io, repr(first(r)), ':', repr(step(r)), ':', repr(last(r)))
     else
         # ugly temporary printing, to avoid 0:0:0 etc.
diff --git a/test/ranges.jl b/test/ranges.jl
index c4cd4664f5f957..0439a626dcac5f 100644
--- a/test/ranges.jl
+++ b/test/ranges.jl
@@ -2392,3 +2392,16 @@ end
     @test test_firstindex(StepRange{Union{Int64,Int128},Int}(Int64(1), 1, Int128(1)))
     @test test_firstindex(StepRange{Union{Int64,Int128},Int}(Int64(1), 1, Int128(0)))
 end
+
+@testset "PR 49516" begin
+	struct PR49516 <: Signed
+		n::Int
+	end
+	PR49516(f::PR49516) = f
+	Base.:*(x::Integer, f::PR49516) = PR49516(*(x, f.n))
+	Base.:+(f1::PR49516, f2::PR49516) = PR49516(+(f1.n, f2.n))
+	Base.show(io::IO, f::PR49516) = print(io, "PR49516(", f.n, ")")
+
+	srl = StepRangeLen(PR49516(1), PR49516(2), 10)
+	@test sprint(show, srl) == "PR49516(1):PR49516(2):PR49516(19)"
+end