fixes 7980

compiler/hlo.nim

@@ -36,6 +36,14 @@ proc applyPatterns(c: PContext, n: PNode): PNode =
   # we apply the last pattern first, so that pattern overriding is possible;
   # however the resulting AST would better not trigger the old rule then
   # anymore ;-)
+  if c.patterns.len > 0:
+
+    # temporary disable converters
+    var ctx_converters: TSymSeq
+    shallowCopy(ctx_converters, c.converters)
+    c.converters = @[]
+    defer: shallowCopy(c.converters, ctx_converters)
+
     for i in countdown(c.patterns.len-1, 0):
       let pattern = c.patterns[i]
       if not isNil(pattern):

tests/template/tpattern_with_converter.nim

@@ -0,0 +1,27 @@
+discard """
+  output: 10.0
+"""
+
+type
+  MyFloat = object
+    val: float
+
+converter to_myfloat*(x: float): MyFloat {.inline.} =
+  MyFloat(val: x)
+
+proc `+`(x1, x2: MyFloat): MyFloat =
+  MyFloat(val: x1.val + x2.val)
+
+proc `*`(x1, x2: MyFloat): MyFloat =
+    MyFloat(val: x1.val * x2.val)
+
+template optMul{`*`(a, 2.0)}(a: MyFloat): MyFloat =
+  a + a
+
+func floatMyFloat(x: MyFloat): MyFloat =
+  result = x * 2.0
+
+func floatDouble(x: float): float =
+  result = x * 2.0
+
+echo floatDouble(5)