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allow where syntax in constructor definitions #35861

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May 13, 2020
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allow where syntax in constructor definitions #35861

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2 changes: 2 additions & 0 deletions NEWS.md
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Expand Up @@ -4,6 +4,8 @@ Julia v1.6 Release Notes
New language features
---------------------

* Types written with `where` syntax can now be used to define constructors, e.g.
`(Foo{T} where T)(x) = ...`.

Language changes
----------------
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2 changes: 1 addition & 1 deletion src/julia-syntax.scm
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Expand Up @@ -1111,7 +1111,7 @@
(and (not (any kwarg? argl)) (not (and (pair? argl)
(pair? (car argl))
(eq? (caar argl) 'parameters))))))
(name (if (or (decl? name) (and (pair? name) (eq? (car name) 'curly)))
(name (if (or (decl? name) (and (pair? name) (memq (car name) '(curly where))))
#f name)))
(expand-forms
(method-def-expr name sparams argl body rett))))
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5 changes: 5 additions & 0 deletions test/core.jl
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Expand Up @@ -4708,6 +4708,11 @@ let ft = Base.datatype_fieldtypes
@test !isdefined(ft(B12238.body.body)[1], :instance) # has free type vars
end

# `where` syntax in constructor definitions
(A12238{T} where T<:Real)(x) = 0
@test A12238{<:Real}(0) == 0
@test_throws MethodError A12238{<:Integer}(0)

# issue #16315
let a = Any[]
@noinline f() = a[end]
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