Commits on Jun 15, 2023

1. Make sure Core.Compiler can throw kwarg mismatch errors …

   The _new_NamedTuple helper was in a Base-only branch, causing
   
   ```
   
   julia> Core.eval(Core.Compiler, quote f(;a=1) = a end)
   f (generic function with 1 method)
   
   julia> Core.Compiler.f(;b=2)
   ERROR: UndefVarError: `_new_NamedTuple` not defined
   Stacktrace:
    [1] macro expansion
      @ Core.Compiler ./namedtuple.jl:0 [inlined]
    [2] structdiff(a::@NamedTuple{b::Int64}, b::Type{NamedTuple{(:a,)}})
      @ Core.Compiler ./namedtuple.jl:421
    [3] top-level scope
      @ REPL[2]:1
   ```
   
   After this change, we have the expected
   ```
   julia> Core.eval(Core.Compiler, quote f(;a=1) = a end)
   f (generic function with 1 method)
   
   julia> Core.Compiler.f(;b=2)
   ERROR: MethodError: no method matching f(; b::Int64)
   
   Closest candidates are:
     f(; a) got unsupported keyword argument "b"
      @ Core REPL[13]:1
   
   Stacktrace:
    [1] kwerr(kw::@NamedTuple{b::Int64}, args::Function)
      @ Core.Compiler ./error.jl:165
    [2] top-level scope
      @ REPL[14]:1
   ```

   

   Keno committed Jun 15, 2023
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