From a1da84c3b0406e8378d8af781fe74ce749725d1f Mon Sep 17 00:00:00 2001
From: Tim Holy <tim.holy@gmail.com>
Date: Tue, 13 Oct 2020 08:46:44 -0500
Subject: [PATCH] Relax a couple of REPL signatures (#37998)

Fixes #37765 and PyPlot docs
---
 stdlib/REPL/src/REPL.jl     | 4 ++--
 stdlib/REPL/src/docview.jl  | 3 ++-
 stdlib/REPL/test/docview.jl | 5 +++++
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/stdlib/REPL/src/REPL.jl b/stdlib/REPL/src/REPL.jl
index 8989c7454cc75..c98d4431a787b 100644
--- a/stdlib/REPL/src/REPL.jl
+++ b/stdlib/REPL/src/REPL.jl
@@ -447,9 +447,9 @@ function complete_line(c::ShellCompletionProvider, s::PromptState)
     return unique!(map(completion_text, ret)), partial[range], should_complete
 end
 
-function complete_line(c::LatexCompletions, s::PromptState)
+function complete_line(c::LatexCompletions, s)
     partial = beforecursor(LineEdit.buffer(s))
-    full = LineEdit.input_string(s)
+    full = LineEdit.input_string(s)::String
     ret, range, should_complete = bslash_completions(full, lastindex(partial))[2]
     return unique!(map(completion_text, ret)), partial[range], should_complete
 end
diff --git a/stdlib/REPL/src/docview.jl b/stdlib/REPL/src/docview.jl
index 3d4dddc72176c..fad0e97878974 100644
--- a/stdlib/REPL/src/docview.jl
+++ b/stdlib/REPL/src/docview.jl
@@ -69,10 +69,11 @@ end
 _helpmode(line::AbstractString) = _helpmode(stdout, line)
 
 # Print vertical lines along each docstring if there are multiple docs
-function insert_hlines(io::IO, docs::Markdown.MD)
+function insert_hlines(io::IO, docs)
     if !isa(docs, Markdown.MD) || !haskey(docs.meta, :results) || isempty(docs.meta[:results])
         return docs
     end
+    docs = docs::Markdown.MD
     v = Any[]
     for (n, doc) in enumerate(docs.content)
         push!(v, doc)
diff --git a/stdlib/REPL/test/docview.jl b/stdlib/REPL/test/docview.jl
index 89e07da952106..aec0fdd52408a 100644
--- a/stdlib/REPL/test/docview.jl
+++ b/stdlib/REPL/test/docview.jl
@@ -2,6 +2,7 @@
 
 using Test
 import REPL
+import Markdown
 
 @testset "symbol completion" begin
     @test startswith(let buf = IOBuffer()
@@ -14,3 +15,7 @@ import REPL
             String(take!(buf))
         end, "\"🐨\" can be typed by \\:koala:<tab>\n")
 end
+
+@testset "Non-Markdown" begin
+    @test isa(REPL.insert_hlines(IOBuffer(), Markdown.Text("foo")), Markdown.Text)
+end