Fix crash in Xcode 13.3 due to Swift 5.6 regression

nicklockwood · Mar 26, 2022 · 929dd4d · 929dd4d
1 parent 2a41d40
commit 929dd4d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Sources/Expression.swift b/Sources/Expression.swift
@@ -351,7 +351,7 @@ public final class Expression: CustomStringConvertible {
         root = expression.root.optimized(
             withImpureSymbols: impureSymbols,
             pureSymbols: {
-                if let fn = pureSymbols($0) ?? Expression.mathSymbols[$0] ?? Expression.boolSymbols[$0] {
+                if let fn = (pureSymbols($0) ?? Expression.mathSymbols[$0]) ?? Expression.boolSymbols[$0] {
                     return fn
                 }
                 if case let .function(name, _) = $0 {