Fix display of operators in a pair (#30427)

JuliaLang · Jan 9, 2019 · 16898e0 · 16898e0
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commit 16898e0
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diff --git a/base/show.jl b/base/show.jl
@@ -576,6 +576,7 @@ has_tight_type(p::Pair) =
     typeof(p.second) == typeof(p).parameters[2]
 
 isdelimited(io::IO, x) = true
+isdelimited(io::IO, x::Function) = !isoperator(Symbol(x))
 
 # !isdelimited means that the Pair is printed with "=>" (like in "1 => 2"),
 # without its explicit type (like in "Pair{Integer,Integer}(1, 2)")

diff --git a/test/show.jl b/test/show.jl
@@ -1007,6 +1007,13 @@ end
     # issue #28327
     d = Dict(Pair{Integer,Integer}(1,2)=>Pair{Integer,Integer}(1,2))
     @test showstr(d) == "Dict((1=>2)=>(1=>2))" # correct parenthesis
+
+    # issue #29536
+    d = Dict((+)=>1)
+    @test showstr(d) == "Dict((+)=>1)"
+
+    d = Dict("+"=>1)
+    @test showstr(d) == "Dict(\"+\"=>1)"
 end
 
 @testset "alignment for pairs" begin  # (#22899)