render a latex environment input as a paragraph

src/Writers/LaTeXWriter.jl

@@ -499,8 +499,15 @@ function _print_code_escapes_inline(io, s::AbstractString)
 end
 
 function latex(io::IO, md::Markdown.Paragraph)
-    for md in md.content
-        latexinline(io, md)
+    if occursin(r"^\h*?\\begin{\p{Xan}*?}", first(md.content))
+        for md in md.content
+            md = Base.replace(md, r"\\$" => "\\\\")
+            Base.print(io.io, md)
+        end
+    else
+        for md in md.content
+            latexinline(io, md)
+        end
     end
     _println(io, "\n")
 end

test/examples/src.latex_simple/index.md

@@ -28,3 +28,26 @@ julia> 127 % Int8
 ```julia-repl sayhello2
 julia> function foo end;
 ```
+
+## Issue 1401
+
+1. The output is a latex tabular environment
+
+```@example
+using DataFrames
+DataFrame(i=1:3, y='A':'C')
+```
+
+2. The paragraph itself is a latex tabular environment
+
+\begin{tabular}{r|ccc}
+        & i & y & z\\
+        \hline
+        & Int64 & Char & Int64\\
+        \hline
+        1 & 1 & 'A' & 5 \\
+        2 & 2 & 'B' & 6 \\
+        3 & 3 & 'C' & 7 \\
+        4 & 4 & 'D' & 8 \\
+\end{tabular}
+