From 66fe51f0ad9531fa782c4dece0669076456f396c Mon Sep 17 00:00:00 2001
From: Ian Butterworth <i.r.butterworth@gmail.com>
Date: Thu, 28 Sep 2023 15:57:19 -0400
Subject: [PATCH] Throw clearer ArgumentError for strip with two string args
 (#51491)

---
 base/strings/util.jl | 4 ++++
 test/strings/util.jl | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/base/strings/util.jl b/base/strings/util.jl
index c77d45255a735..bd4da03ce1571 100644
--- a/base/strings/util.jl
+++ b/base/strings/util.jl
@@ -369,6 +369,7 @@ function lstrip(f, s::AbstractString)
 end
 lstrip(s::AbstractString) = lstrip(isspace, s)
 lstrip(s::AbstractString, chars::Chars) = lstrip(in(chars), s)
+lstrip(::AbstractString, ::AbstractString) = throw(ArgumentError("Both arguments are strings. The second argument should be a `Char` or collection of `Char`s"))
 
 """
     rstrip([pred=isspace,] str::AbstractString) -> SubString
@@ -402,6 +403,8 @@ function rstrip(f, s::AbstractString)
 end
 rstrip(s::AbstractString) = rstrip(isspace, s)
 rstrip(s::AbstractString, chars::Chars) = rstrip(in(chars), s)
+rstrip(::AbstractString, ::AbstractString) = throw(ArgumentError("Both arguments are strings. The second argument should be a `Char` or collection of `Char`s"))
+
 
 """
     strip([pred=isspace,] str::AbstractString) -> SubString
@@ -429,6 +432,7 @@ julia> strip("{3, 5}\\n", ['{', '}', '\\n'])
 """
 strip(s::AbstractString) = lstrip(rstrip(s))
 strip(s::AbstractString, chars::Chars) = lstrip(rstrip(s, chars), chars)
+strip(::AbstractString, ::AbstractString) = throw(ArgumentError("Both arguments are strings. The second argument should be a `Char` or collection of `Char`s"))
 strip(f, s::AbstractString) = lstrip(f, rstrip(f, s))
 
 ## string padding functions ##
diff --git a/test/strings/util.jl b/test/strings/util.jl
index 8b58c2f36d8c4..0ad958eebb7f9 100644
--- a/test/strings/util.jl
+++ b/test/strings/util.jl
@@ -89,6 +89,10 @@ end
     @test rstrip(isnumeric, "abc0123") == "abc"
     @test lstrip("ello", ['e','o']) == "llo"
     @test rstrip("ello", ['e','o']) == "ell"
+
+    @test_throws ArgumentError strip("", "")
+    @test_throws ArgumentError lstrip("", "")
+    @test_throws ArgumentError rstrip("", "")
 end
 
 @testset "partition" begin