collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function 0 2 ─ invoke Base.Math.throw_complex_domainerror(:sqrt::Symbol, %3::Float64)::Union{} 0 └── unreachable 20 3 ─ %8 = Base.Math.sqrt_llvm(%3)::Float64 0 └── goto #4 0 4 ─ goto #5 0 5 ─ %11 = Core.

collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function 0 2 ─ invoke Base.Math.throw_complex_domainerror(:sqrt::Symbol, %3::Float64)::Union{} 0 └── unreachable 20 3 ─ %8 = Base.Math.sqrt_llvm(%3)::Float64 0 └── goto #4 0 4 ─ goto #5 0 5 ─ %11 = Core.

collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function 0 2 ─ invoke Base.Math.throw_complex_domainerror(:sqrt::Symbol, %3::Float64)::Union{} 0 └── unreachable 20 3 ─ %8 = Base.Math.sqrt_llvm(%3)::Float64 0 └── goto #4 0 4 ─ goto #5 0 5 ─ %11 = Core.

Needing this feature is uncommon. Note in particular that the specified Method may be entirely unreachable from ordinary dispatch (or ordinary invoke), e.g. because it was replaced or fully covered by collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement.CHAPTER 106. DOCUMENTATION OF JULIA'S INTERNALS 1867 • QuoteNode Wraps an arbitrary

Needing this feature is uncommon. Note in particular that the specified Method may be entirely unreachable from ordinary dispatch (or ordinary invoke), e.g. because it was replaced or fully covered by collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function

Needing this feature is uncommon. Note in particular that the specified Method may be entirely unreachable from ordinary dispatch (or ordinary invoke), e.g. because it was replaced or fully covered by collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function

Needing this feature is uncommon. Note in particular that the specified Method may be entirely unreachable from ordinary dispatch (or ordinary invoke), e.g. because it was replaced or fully covered by collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function

Needing this feature is uncommon. Note in particular that the specified Method may be entirely unreachable from ordinary dispatch (or ordinary invoke), e.g. because it was replaced or fully covered by collection (default) traverses all live objects (i.e. full mark) and should reclaim memory from all unreachable objects. An incremental collection only reclaims memory from young objects which are not reachable the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function

the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function 0 2 ─ invoke Base.Math.throw_complex_domainerror(:sqrt::Symbol, %2::Float64)::Union{} 0 └── unreachable 20 3 ─ %7 = Base.Math.sqrt_llvm(%2)::Float64 0 └── goto #4 0 4 ─ goto #5 0 5 ─ %10 = Core. invoke Main.error()::Union{}└──CHAPTER 101. DOCUMENTATION OF JULIA’S INTERNALS 1605 $(Expr(:unreachable))::Union{} 4 ┄ %13 = φᶜ (%3, %6, %9)::Bool│ %14 = φᶜ (%4, %7, %10)::Core.Compiler.MaybeUndef(Int64)│

the value of the enclosing function. If the val field is unde- fined, then this represents an unreachable statement. • QuoteNode Wraps an arbitrary value to reference as data. For example, the function 0 2 ─ invoke Base.Math.throw_complex_domainerror(:sqrt::Symbol, %2::Float64)::Union{} 0 └── unreachable 20 3 ─ %7 = Base.Math.sqrt_llvm(%2)::Float64 0 └── goto #4 0 4 ─ goto #5 0 5 ─ %10 = Core. invoke Main.error()::Union{}└──CHAPTER 101. DOCUMENTATION OF JULIA’S INTERNALS 1605 $(Expr(:unreachable))::Union{} 4 ┄ %13 = φᶜ (%3, %6, %9)::Bool│ %14 = φᶜ (%4, %7, %10)::Core.Compiler.MaybeUndef(Int64)│