5 files changed, 11 insertions, 115 deletions
diff --git a/lib/system/assertions.nim b/lib/system/assertions.nim
deleted file mode 100644
index 6f64a55b7..000000000
--- a/lib/system/assertions.nim
+++ /dev/null
@@ -1,115 +0,0 @@
-## This module provides various assertion utilities.
-##
-## **Note:** This module is reexported by `system` and thus does not need to be
-## imported directly (with `system/assertions`).
-
-when not declared(sysFatal):
-  include "system/fatal"
-
-import std/private/miscdollars
-# ---------------------------------------------------------------------------
-# helpers
-
-type InstantiationInfo = tuple[filename: string, line: int, column: int]
-
-proc `$`(info: InstantiationInfo): string =
-  # The +1 is needed here
-  # instead of overriding `$` (and changing its meaning), consider explicit name.
-  result = ""
-  result.toLocation(info.filename, info.line, info.column + 1)
-
-# ---------------------------------------------------------------------------
-
-when not defined(nimHasSinkInference):
-  {.pragma: nosinks.}
-
-proc raiseAssert*(msg: string) {.noinline, noreturn, nosinks.} =
-  ## Raises an `AssertionDefect` with `msg`.
-  sysFatal(AssertionDefect, msg)
-
-proc failedAssertImpl*(msg: string) {.raises: [], tags: [].} =
-  ## Raises an `AssertionDefect` with `msg`, but this is hidden
-  ## from the effect system. Called when an assertion failed.
-  # trick the compiler to not list `AssertionDefect` when called
-  # by `assert`.
-  # xxx simplify this pending bootstrap >= 1.4.0, after which cast not needed
-  # anymore since `Defect` can't be raised.
-  type Hide = proc (msg: string) {.noinline, raises: [], noSideEffect, tags: [].}
-  cast[Hide](raiseAssert)(msg)
-
-template assertImpl(cond: bool, msg: string, expr: string, enabled: static[bool]) =
-  when enabled:
-    const
-      loc = instantiationInfo(fullPaths = compileOption("excessiveStackTrace"))
-      ploc = $loc
-    bind instantiationInfo
-    mixin failedAssertImpl
-    {.line: loc.}:
-      if not cond:
-        failedAssertImpl(ploc & " `" & expr & "` " & msg)
-
-template assert*(cond: untyped, msg = "") =
-  ## Raises `AssertionDefect` with `msg` if `cond` is false. Note
-  ## that `AssertionDefect` is hidden from the effect system, so it doesn't
-  ## produce `{.raises: [AssertionDefect].}`. This exception is only supposed
-  ## to be caught by unit testing frameworks.
-  ##
-  ## No code will be generated for `assert` when passing `-d:danger` (implied by `--assertions:off`).
-  ## See `command line switches <nimc.html#compiler-usage-commandminusline-switches>`_.
-  runnableExamples: assert 1 == 1
-  runnableExamples("--assertions:off"):
-    assert 1 == 2 # no code generated, no failure here
-  runnableExamples("-d:danger"): assert 1 == 2 # ditto
-  assertImpl(cond, msg, astToStr(cond), compileOption("assertions"))
-
-template doAssert*(cond: untyped, msg = "") =
-  ## Similar to `assert <#assert.t,untyped,string>`_ but is always turned on regardless of `--assertions`.
-  runnableExamples:
-    doAssert 1 == 1 # generates code even when built with `-d:danger` or `--assertions:off`
-  assertImpl(cond, msg, astToStr(cond), true)
-
-template onFailedAssert*(msg, code: untyped): untyped {.dirty.} =
-  ## Sets an assertion failure handler that will intercept any assert
-  ## statements following `onFailedAssert` in the current scope.
-  runnableExamples:
-    type MyError = object of CatchableError
-      lineinfo: tuple[filename: string, line: int, column: int]
-    # block-wide policy to change the failed assert exception type in order to
-    # include a lineinfo
-    onFailedAssert(msg):
-      raise (ref MyError)(msg: msg, lineinfo: instantiationInfo(-2))
-    doAssertRaises(MyError): doAssert false
-  template failedAssertImpl(msgIMPL: string): untyped {.dirty.} =
-    let msg = msgIMPL
-    code
-
-template doAssertRaises*(exception: typedesc, code: untyped) =
-  ## Raises `AssertionDefect` if specified `code` does not raise `exception`.
-  runnableExamples:
-    doAssertRaises(ValueError): raise newException(ValueError, "Hello World")
-    doAssertRaises(CatchableError): raise newException(ValueError, "Hello World")
-    doAssertRaises(AssertionDefect): doAssert false
-  var wrong = false
-  const begin = "expected raising '" & astToStr(exception) & "', instead"
-  const msgEnd = " by: " & astToStr(code)
-  template raisedForeign = raiseAssert(begin & " raised foreign exception" & msgEnd)
-  when Exception is exception:
-    try:
-      if true:
-        code
-      wrong = true
-    except Exception as e: discard
-    except: raisedForeign()
-  else:
-    try:
-      if true:
-        code
-      wrong = true
-    except exception:
-      discard
-    except Exception as e:
-      mixin `$` # alternatively, we could define $cstring in this module
-      raiseAssert(begin & " raised '" & $e.name & "'" & msgEnd)
-    except: raisedForeign()
-  if wrong:
-    raiseAssert(begin & " nothing was raised" & msgEnd)
diff --git a/lib/system/dragonbox.nim b/lib/system/dragonbox.nim
index 336c982c1..34ae9e210 100644
--- a/lib/system/dragonbox.nim
+++ b/lib/system/dragonbox.nim
@@ -24,6 +24,8 @@
 
 import std/private/digitsutils
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
 
 const
   dtoaMinBufferLength*: cint = 64
diff --git a/lib/system/formatfloat.nim b/lib/system/formatfloat.nim
index 3bcd3257b..aada3e1bf 100644
--- a/lib/system/formatfloat.nim
+++ b/lib/system/formatfloat.nim
@@ -7,6 +7,9 @@
 #    distribution, for details about the copyright.
 #
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 proc c_memcpy(a, b: pointer, size: csize_t): pointer {.importc: "memcpy", header: "<string.h>", discardable.}
 
 proc addCstringN(result: var string, buf: cstring; buflen: int) =
diff --git a/lib/system/iterators.nim b/lib/system/iterators.nim
index f23f7aa11..6d33fc0bc 100644
--- a/lib/system/iterators.nim
+++ b/lib/system/iterators.nim
@@ -1,3 +1,6 @@
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 when defined(nimHasLentIterators) and not defined(nimNoLentIterators):
   template lent2(T): untyped = lent T
 else:
diff --git a/lib/system/schubfach.nim b/lib/system/schubfach.nim
index 06813f632..7d6861e35 100644
--- a/lib/system/schubfach.nim
+++ b/lib/system/schubfach.nim
@@ -12,6 +12,9 @@
 
 import std/private/digitsutils
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 
 template sf_Assert(x: untyped): untyped =
   assert(x)