equality check on NimSym has now support in the VM; refs #6139

lib/core/macros.nim

@@ -150,6 +150,9 @@ proc `==`*(a, b: NimIdent): bool {.magic: "EqIdent", noSideEffect.}
 proc `==`*(a, b: NimNode): bool {.magic: "EqNimrodNode", noSideEffect.}
   ## compares two Nim nodes
 
+proc `==`*(a, b: NimSym): bool {.magic: "EqNimrodNode", noSideEffect.}
+  ## compares two Nim symbols
+
 proc sameType*(a, b: NimNode): bool {.magic: "SameNodeType", noSideEffect.} =
   ## compares two Nim nodes' types. Return true if the types are the same,
   ## eg. true when comparing alias with original type.

tests/gensym/tgensymgeneric.nim

@@ -1,3 +1,7 @@
+discard """
+  output: '''true'''
+"""
+
 # We need to open the gensym'ed symbol again so that the instantiation
 # creates a fresh copy; but this is wrong the very first reason for gensym
 # is that scope rules cannot be used! So simply removing 'sfGenSym' does
@@ -28,4 +32,23 @@ var
 let x = gen(a)
 let y = gen(b)
 
-echo x.x, " ", y.x
+doAssert x.x == 123
+doAssert y.x == "abc"
+
+# test symbol equality
+
+import macros
+
+static:
+  let sym1   = genSym()
+  let sym2   = genSym()
+  let sym3   = sym1
+  let nimsym = sym1.symbol
+  doAssert sym1        == sym1
+  doAssert sym2        != sym3
+  doAssert sym2.symbol != sym3.symbol
+  doAssert sym3        == sym1
+  doAssert sym1.symbol == sym1.symbol
+  doAssert nimsym      == nimsym
+
+echo "true"