New type system: stackoverflow when defining method #20103
Description
I'm pretty sure this only showed up after the #18457 merge (maybe add to list in #19998):
_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: http://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.6.0-dev.2153 (2017-01-18 05:52 UTC)
_/ |\__'_|_|_|\__'_| | Commit b8971ea4f* (0 days old master)
|__/ | x86_64-pc-linux-gnu
julia> immutable TT{X,Y} end
julia> f{X,Y}(::Type{TT{X,Y}},x::X,y::Y) = 1
f (generic function with 1 method)
julia> f{X}(::Type{TT{X,X}},x::X) = 100
ERROR: StackOverflowError:
julia> f(TT{Int,Int},1,2)
1
julia> f(TT{Int,Int},1) # it still works fine!
100
julia> methods(f)
# 2 methods for generic function "f":
f{X}(::Type{TT{X,X}}, x::X) in Main at REPL[3]:1
f{X,Y}(::Type{TT{X,Y}}, x::X, y::Y) in Main at REPL[2]:1