Translate new construction of NamedTuple (#156)

* translate new construction of NamedTuple

* Update src/tapedfunction.jl

* Update Project.toml

Co-authored-by: Hong Ge <3279477+yebai@users.noreply.github.com>

Author: KDr2

Project.toml

@@ -3,7 +3,7 @@ uuid = "6f1fad26-d15e-5dc8-ae53-837a1d7b8c9f"
 license = "MIT"
 desc = "Tape based task copying in Turing"
 repo = "https://github.com/TuringLang/Libtask.jl.git"
-version = "0.8.1"
+version = "0.8.2"
 
 [deps]
 FunctionWrappers = "069b7b12-0de2-55c6-9aab-29f3d0a68a2e"

src/tapedfunction.jl

@@ -369,6 +369,15 @@ function translate!!(var::IRVar, line::Core.SlotNumber,
     return Instruction(func, input, output)
 end
 
+function translate!!(var::IRVar, line::NTuple{N, Symbol},
+                     bindings::Bindings, isconst::Bool, ir) where {N}
+    # for syntax (; x, y, z), see Turing.jl#1873
+    func = identity
+    input = (bind_var!(line, bindings, ir),)
+    output =  bind_var!(var, bindings, ir)
+    return Instruction(func, input, output)
+end
+
 function translate!!(var::IRVar, line::Core.TypedSlot,
                      bindings::Bindings, isconst::Bool, ir)
     input_box = bind_var!(Core.SlotNumber(line.id), bindings, ir)
@@ -437,7 +446,7 @@ function translate!!(var::IRVar, line::Expr,
     end
 end
 
-function translate!!(var, line, bindings, ir)
+function translate!!(var, line, bindings, isconst, ir)
     @error "Unknown IR code: " typeof(var) var typeof(line) line
     throw(ErrorException("Unknown IR code"))
 end

test/issues.jl

@@ -48,4 +48,15 @@
         ttask = TapedTask(f, 2)
         @test consume(ttask) == 1
     end
+
+    @testset "Issue-Turing-1873, NamedTuple syntax" begin
+        function g(x, y)
+            c = x + y
+            return (; c, x, y)
+        end
+
+        tf = Libtask.TapedFunction(g, 1, 2)
+        r = tf(1, 2)
+        @test r == (c=3, x=1, y=2)
+    end
 end