remove {.this.} pragma, deprecated since 0.19 (#20201)

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

tests/destructor/tcustomstrings.nim

@@ -8,8 +8,6 @@ after 20 20'''
 joinable: false
 """
 
-{.this: self.}
-
 type
   mystring = object
     len, cap: int
@@ -51,7 +49,7 @@ proc resize(self: var mystring) =
   if self.cap == 0: self.cap = 8
   else: self.cap = (self.cap * 3) shr 1
   if self.data == nil: inc allocCount
-  self.data = cast[type(data)](realloc(self.data, self.cap + 1))
+  self.data = cast[type(self.data)](realloc(self.data, self.cap + 1))
 
 proc add*(self: var mystring; c: char) =
   if self.len >= self.cap: resize(self)
@@ -60,17 +58,17 @@ proc add*(self: var mystring; c: char) =
   inc self.len
 
 proc ensure(self: var mystring; newLen: int) =
-  if newLen >= cap:
-    cap = max((cap * 3) shr 1, newLen)
-    if cap > 0:
-      if data == nil: inc allocCount
-      data = cast[type(data)](realloc(data, cap + 1))
+  if newLen >= self.cap:
+    self.cap = max((self.cap * 3) shr 1, newLen)
+    if self.cap > 0:
+      if self.data == nil: inc allocCount
+      self.data = cast[type(self.data)](realloc(self.data, self.cap + 1))
 
 proc add*(self: var mystring; y: mystring) =
-  let newLen = len + y.len
+  let newLen = self.len + y.len
   ensure(self, newLen)
-  copyMem(addr data[len], y.data, y.data.len + 1)
-  len = newLen
+  copyMem(addr self.data[self.len], y.data, y.data.len + 1)
+  self.len = newLen
 
 proc create*(lit: string): mystring =
   let newLen = lit.len

tests/misc/tupcomingfeatures.nim

@@ -1,35 +0,0 @@
-discard """
-  output: '''0 -2 0
-0 -2'''
-"""
-
-{.this: self.}
-
-type
-  Foo = object
-    a, b, x: int
-
-proc yay(self: Foo) =
-  echo a, " ", b, " ", x
-
-proc footest[T](self: var Foo, a: T) =
-  b = 1+a
-  yay()
-
-proc nongeneric(self: Foo) =
-  echo a, " ", b
-
-var ff: Foo
-footest(ff, -3)
-ff.nongeneric
-
-{.experimental.}
-using
-  c: Foo
-  x, y: int
-
-proc usesSig(c) =
-  echo "yummy"
-
-proc foobar(c, y) =
-  echo "yay"

tests/overload/tselfderef.nim

@@ -1,20 +0,0 @@
-discard """
-action: compile
-"""
-
-# bug #4671
-{.experimental.}
-{.this: self.}
-type
-  SomeObj = object
-    f: int
-
-proc f(num: int) =
-  discard
-
-var intptr: ptr int
-intptr.f() # compiles fine
-
-proc doSomething(self: var SomeObj) =
-  var pint: ptr int
-  pint.f() # Error: expression '.(pint, "f")' cannot be called

tests/usingstmt/tthis.nim

@@ -1,15 +0,0 @@
-
-# bug #4177
-
-type
-  Parent = object of RootObj
-    parentField: int
-  Child = object of Parent
-    childField: int
-
-{.this: self.}
-proc sumFields(self: Child): int =
-  result = parentField + childField # Error: undeclared identifier: 'parentField'
-
-proc sumFieldsWorks(self: Child): int =
-  result = self.parentField + childField

tests/usingstmt/tusingstmt.nim

@@ -0,0 +1,16 @@
+type
+  Foo = object
+
+using
+  c: Foo
+  x, y: int
+
+proc usesSig(c) = discard
+
+proc foobar(c, y) = discard
+
+usesSig(Foo())
+foobar(Foo(), 123)
+doAssert not compiles(usesSig(123))
+doAssert not compiles(foobar(Foo(), Foo()))
+doAssert not compiles(foobar(123, 123))