use arrow precedence in spec (nim-lang#20166)

* test using arrow precedence in spec refs nim-lang#8759 * add test for nim-lang#8759
capocasa · Mar 31, 2023 · a7aab4c · a7aab4c
1 parent 0f9a473
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diff --git a/compiler/lexer.nim b/compiler/lexer.nim
@@ -973,7 +973,7 @@ proc getPrecedence*(tok: Token): int =
 
     # arrow like?
     if tok.ident.s.len > 1 and tok.ident.s[^1] == '>' and
-      tok.ident.s[^2] in {'-', '~', '='}: return 1
+      tok.ident.s[^2] in {'-', '~', '='}: return 0
 
     template considerAsgn(value: untyped) =
       result = if tok.ident.s[^1] == '=': 1 else: value

diff --git a/tests/parser/tprecedence.nim b/tests/parser/tprecedence.nim
@@ -54,3 +54,10 @@ let
 const
   test =
     proc(): int = 1
+
+# bug #8759
+block:
+  template `=>`(a, b): untyped = (a, b)
+  template `+=`(a, b): untyped = a * b
+
+  doAssert ("abc" => 3 += 5) == ("abc", 15)