10 files changed, 270 insertions, 0 deletions
diff --git a/tests/varres/tnewseq_on_result_vart.nim b/tests/varres/tnewseq_on_result_vart.nim
new file mode 100644
index 000000000..4a700468f
--- /dev/null
+++ b/tests/varres/tnewseq_on_result_vart.nim
@@ -0,0 +1,9 @@
+
+discard """
+  errormsg: "address of 'result' may not escape its stack frame"
+  line: 9
+"""
+# bug #5113
+
+proc makeSeqVar(size: Natural): var seq[int] =
+  newSeq(result, size)
diff --git a/tests/varres/tprevent_forloopvar_mutations.nim b/tests/varres/tprevent_forloopvar_mutations.nim
new file mode 100644
index 000000000..c9aeb94d8
--- /dev/null
+++ b/tests/varres/tprevent_forloopvar_mutations.nim
@@ -0,0 +1,16 @@
+discard """
+  errormsg: "type mismatch: got <int>"
+  nimout: '''tprevent_forloopvar_mutations.nim(16, 3) Error: type mismatch: got <int>
+but expected one of:
+proc inc[T, V: Ordinal](x: var T; y: V = 1)
+  first type mismatch at position: 1
+  required type for x: var T: Ordinal
+  but expression 'i' is immutable, not 'var'
+
+expression: inc i
+'''
+"""
+
+for i in 0..10:
+  echo i
+  inc i
diff --git a/tests/varres/tvarres0.nim b/tests/varres/tvarres0.nim
new file mode 100644
index 000000000..94bdb4a06
--- /dev/null
+++ b/tests/varres/tvarres0.nim
@@ -0,0 +1,141 @@
+discard """
+  output: '''123
+1234
+123
+1234
+12345
+123456
+'''
+"""
+
+# Test simple type
+var a = 123
+proc getA(): var int = a
+
+echo getA()
+
+getA() = 1234
+echo getA()
+
+
+# Test object type
+type Foo = object
+    a: int
+var f: Foo
+f.a = 123
+proc getF(): var Foo = f
+echo getF().a
+getF().a = 1234
+echo getF().a
+getF() = Foo(a: 12345)
+echo getF().a
+(addr getF())[] = Foo(a: 123456)
+echo getF().a
+
+
+block: # #13848
+  template fun() =
+    block:
+      var m = 1
+
+      proc identity(o: var int): var int =
+        result = o
+        result += 5
+
+      identity(m) += 3
+      doAssert m == 5+4
+
+    block:
+      var m = 10
+      proc identity2(o: var int): var int =
+        result = m
+        result += 100
+
+      var ignored = 27
+      identity2(ignored) += 7
+      doAssert m == 10 + 100 + 7
+
+    block:
+      iterator test3(o: var int): var int = yield o
+      var m = 1
+      for m2 in test3(m): m2+=3
+      doAssert m == 4
+
+  static: fun()
+  fun()
+
+  template fun2() =
+    block:
+      var m = 1
+      var m2 = 1
+      iterator test3(o: var int): (var int, var int) =
+        yield (o, m2)
+
+      for ti in test3(m):
+        ti[0]+=3
+        ti[1]+=4
+
+      doAssert (m, m2) == (4, 5)
+  fun2()
+  # static: fun2() # BUG: Error: attempt to access a nil address kind: rkInt
+
+  template fun3() =
+    block:
+      proc test4[T1](o: var T1): var int = o[1]
+      block:
+        var m = @[1,2]
+        test4(m) += 10
+        doAssert m[1] == 2+10
+      block:
+        var m = [1,2]
+        test4(m) += 10
+        doAssert m[1] == 2+10
+      block:
+        var m = (1, 2)
+        test4(m) += 10
+        doAssert m[1] == 2+10
+
+      proc test5[T1](o: var T1): var int = o.x
+      block:
+        type Foo = object
+          x: int
+        var m = Foo(x: 2)
+        test5(m) += 10
+        doAssert m.x == 2+10
+      block:
+        type Foo = ref object
+          x: int
+        var m = Foo(x: 2)
+        test5(m) += 10
+        doAssert m.x == 2+10
+
+      proc test6[T1](o: T1): var int = o.x
+      block:
+        type Foo = ref object
+          x: int
+        var m = Foo(x: 2)
+        test6(m) += 10
+        doAssert m.x == 2+10
+
+  fun3()
+  static: fun3()
+
+  when false:
+    # BUG:
+    # c: SIGSEGV
+    # cpp: error: call to implicitly-deleted default constructor of 'tyTuple__ILZebuYefUeQLAzY85QkHA'
+    proc test7[T](o: var T): (var int,) =
+      (o[1], )
+    var m = @[1,2]
+    test7(m)[0] += 10
+
+block:
+  # example from #13848
+  type
+    MyType[T] = object
+      a,b: T
+    MyTypeAlias = MyType[float32]
+
+  var m: MyTypeAlias
+  proc identity(o: var MyTypeAlias): var MyTypeAlias = o
+  discard identity(m)
diff --git a/tests/varres/tvarres1.nim b/tests/varres/tvarres1.nim
new file mode 100644
index 000000000..e58d7f083
--- /dev/null
+++ b/tests/varres/tvarres1.nim
@@ -0,0 +1,16 @@
+discard """
+  errormsg: "'bla' escapes its stack frame; context: 'bla'"
+  file: "tvarres1.nim"
+  line: 12
+"""
+
+var
+  g = 5
+
+proc p(): var int =
+  var bla: int
+  result = bla
+
+p() = 45
+
+echo g
diff --git a/tests/varres/tvarres2.nim b/tests/varres/tvarres2.nim
new file mode 100644
index 000000000..4ec0bb05b
--- /dev/null
+++ b/tests/varres/tvarres2.nim
@@ -0,0 +1,15 @@
+discard """
+  errormsg: "expression has no address"
+  file: "tvarres2.nim"
+  line: 11
+"""
+
+var
+  g = 5
+
+proc p(): var int =
+  result = 89
+
+p() = 45
+
+echo g
diff --git a/tests/varres/tvarres3.nim b/tests/varres/tvarres3.nim
new file mode 100644
index 000000000..9a46bfb4e
--- /dev/null
+++ b/tests/varres/tvarres3.nim
@@ -0,0 +1,15 @@
+discard """
+  output: "45"
+"""
+
+var
+  g = 5
+
+proc p(): var int =
+  var bla = addr(g) #: array[0..7, int]
+  result = bla[]
+
+p() = 45
+
+echo g
+
diff --git a/tests/varres/tvarres4.nim b/tests/varres/tvarres4.nim
new file mode 100644
index 000000000..119560e7b
--- /dev/null
+++ b/tests/varres/tvarres4.nim
@@ -0,0 +1,20 @@
+discard """
+  output: "45 hallo"
+"""
+
+type
+  TKachel = tuple[i: int, s: string]
+  TSpielwiese = object
+    k: seq[TKachel]
+
+var
+  spielwiese: TSpielwiese
+newSeq(spielwiese.k, 64)
+
+proc at*(s: var TSpielwiese, x, y: int): var TKachel =
+  result = s.k[y * 8 + x]
+
+spielwiese.at(3, 4) = (45, "hallo")
+
+echo spielwiese.at(3,4)[0], " ", spielwiese.at(3,4)[1]
+
diff --git a/tests/varres/tvarres_via_forwarding.nim b/tests/varres/tvarres_via_forwarding.nim
new file mode 100644
index 000000000..fb7201ad2
--- /dev/null
+++ b/tests/varres/tvarres_via_forwarding.nim
@@ -0,0 +1,12 @@
+discard """
+  errormsg: "'y' escapes its stack frame; context: 'forward(y)'"
+  line: 10
+"""
+
+proc forward(x: var int): var int = result = x
+
+proc foo(): var int =
+  var y = 9
+  result = forward(y)
+
+echo foo()
diff --git a/tests/varres/tvartup.nim b/tests/varres/tvartup.nim
new file mode 100644
index 000000000..a8f15b232
--- /dev/null
+++ b/tests/varres/tvartup.nim
@@ -0,0 +1,10 @@
+discard """
+  output: "2 3"
+"""
+# Test the new tuple unpacking
+
+proc divmod(a, b: int): tuple[di, mo: int] =
+  return (a div b, a mod b)
+
+var (x, y) = divmod(15, 6)
+echo x, " ", y
diff --git a/tests/varres/twrong_parameter.nim b/tests/varres/twrong_parameter.nim
new file mode 100644
index 000000000..58d01fd7e
--- /dev/null
+++ b/tests/varres/twrong_parameter.nim
@@ -0,0 +1,16 @@
+discard """
+  errormsg: "'x' is not the first parameter; context: 'x.field[0]'"
+  line: 10
+"""
+
+type
+  MyObject = object
+    field: array[2, int]
+
+proc forward(abc: int; x: var MyObject): var int = result = x.field[0]
+
+proc foo(): var int =
+  var y: MyObject
+  result = forward(45, y)
+
+echo foo()