add => to operator precedence table (#28026)

JuliaLang · Jul 11, 2018 · 060e51b · 060e51b
1 parent 3a4c05e
commit 060e51b
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/base/show.jl b/base/show.jl
@@ -869,8 +869,9 @@ julia> Base.operator_precedence(:sin), Base.operator_precedence(:+=), Base.opera
 operator_precedence(s::Symbol) = Int(ccall(:jl_operator_precedence, Cint, (Cstring,), s))
 operator_precedence(x::Any) = 0 # fallback for generic expression nodes
 const prec_assignment = operator_precedence(:(=))
-const prec_arrow = operator_precedence(:(-->))
+const prec_pair = operator_precedence(:(=>))
 const prec_control_flow = operator_precedence(:(&&))
+const prec_arrow = operator_precedence(:(-->))
 const prec_comparison = operator_precedence(:(>))
 const prec_power = operator_precedence(:(^))
 const prec_decl = operator_precedence(:(::))
@@ -892,7 +893,7 @@ julia> Base.operator_associativity(:⊗), Base.operator_associativity(:sin), Bas
 ```
 """
 function operator_associativity(s::Symbol)
- if operator_precedence(s) in (prec_arrow, prec_assignment, prec_control_flow, prec_power) ||
+ if operator_precedence(s) in (prec_arrow, prec_assignment, prec_control_flow, prec_pair, prec_power) ||
  (isunaryoperator(s) && !is_unary_and_binary_operator(s)) || s === :<|
  return :right
  elseif operator_precedence(s) in (0, prec_comparison) || s in (:+, :++, :*)

diff --git a/doc/src/manual/mathematical-operations.md b/doc/src/manual/mathematical-operations.md
@@ -366,6 +366,7 @@ Julia applies the following order and associativity of operations, from highest
 | Syntax | `<\|` | Right |
 | Comparisons | `> < >= <= == === != !== <:` | Non-associative |
 | Control flow | `&&` followed by `\|\|` followed by `?` | Right |
+| Pair | `=>` | Right |
 | Assignments | `= += -= *= /= //= \= ^= ÷= %= \|= &= ⊻= <<= >>= >>>=` | Right |
 
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