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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/59f4cb6fb73ade6f9b0bdc85380dfddba93bf14b">59f4cb6f</a></strong>
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<span>by Iavor Diatchki</span>
<i>at 2019-05-24T02:39:35Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a `NOINLINE` pragma on `someNatVal` (#16586)
This fixes #16586, see `Note [NOINLINE someNatVal]` for details.
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<h4>5 changed files:</h4>
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<a href="#92fed88efc6a2e0461a84dd0d0f0bfb89bdbc799">
libraries/base/GHC/TypeLits.hs
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<a href="#613eb2a1c706c7ea57be637d2c8ed135d1d2af29">
libraries/base/GHC/TypeNats.hs
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testsuite/tests/lib/base/T16586.hs
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testsuite/tests/lib/base/T16586.stdout
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testsuite/tests/lib/base/all.T
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<h4>Changes:</h4>
<li id="92fed88efc6a2e0461a84dd0d0f0bfb89bdbc799">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/59f4cb6fb73ade6f9b0bdc85380dfddba93bf14b#92fed88efc6a2e0461a84dd0d0f0bfb89bdbc799"><strong>libraries/base/GHC/TypeLits.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -105,6 +105,9 @@ someNatVal n</td>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.7.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">someSymbolVal</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SomeSymbol</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">someSymbolVal</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">withSSymbol</span> <span class="kt" style="color: #458; font-weight: 600;">SomeSymbol</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SSymbol</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE someSymbolVal #-}</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For details see Note [NOINLINE someNatVal] in "GHC.TypeNats"</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The issue described there applies to `someSymbolVal` as well.</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="cd">-- | @since 4.7.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="kt" style="color: #458; font-weight: 600;">SomeSymbol</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<li id="613eb2a1c706c7ea57be637d2c8ed135d1d2af29">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/59f4cb6fb73ade6f9b0bdc85380dfddba93bf14b#613eb2a1c706c7ea57be637d2c8ed135d1d2af29"><strong>libraries/base/GHC/TypeNats.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -78,6 +78,65 @@ data SomeNat = forall n. KnownNat n => SomeNat (Proxy n)</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.10.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="n" style="color: #333;">someNatVal</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Natural</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SomeNat</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="n" style="color: #333;">someNatVal</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">withSNat</span> <span class="kt" style="color: #458; font-weight: 600;">SomeNat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE someNatVal #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [NOINLINE someNatVal]</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [NOINLINE someNatVal]</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`someNatVal` converts a natural number to an existentially quantified</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dictionary for `KnowNat` (aka `SomeNat`). The existential quantification</span></span>
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87
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is very important, as it captures the fact that we don't know the type</span></span>
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88
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">statically, although we do know that it exists. Because this type is</span></span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fully opaque, we should never be able to prove that it matches anything else.</span></span>
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90
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is why coherence should still hold: we can manufacture a `KnownNat k`</span></span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dictionary, but it can never be confused with a `KnownNat 33` dictionary,</span></span>
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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because we should never be able to prove that `k ~ 33`.</span></span>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"></span>
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94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But how to implement `someNatVal`? We can't quite implement it "honestly"</span></span>
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95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because `SomeNat` needs to "hide" the type of the newly created dictionary,</span></span>
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96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but we don't know what the actual type is! If `someNatVal` was built into</span></span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the language, then we could manufacture a new skolem constant,</span></span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which should behave correctly.</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since extra language constructors have additional maintenance costs,</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we use a trick to implement `someNatVal` in the library. The idea is that</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instead of generating a "fresh" type for each use of `someNatVal`, we simply</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">use GHC's placeholder type `Any` (of kind `Nat`). So, the elaborated</span></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">version of the code is:</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> someNatVal n = withSNat @T (SomeNat @T) (SNat @T n) (Proxy @T)</span></span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where type T = Any Nat</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">After inlining and simplification, this ends up looking something like this:</span></span>
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110
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> someNatVal n = SomeNat @T (KnownNat @T (SNat @T n)) (Proxy @T)</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where type T = Any Nat</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`KnownNat` is the constructor for dictionaries for the class `KnownNat`.</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [magicDictId magic] in "basicType/MkId.hs" for details on how</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we actually construct the dictionry.</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that using `Any Nat` is not really correct, as multilple calls to</span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`someNatVal` would violate coherence:</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type T = Any Nat</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = SomeNat @T (KnownNat @T (SNat @T 1)) (Proxy @T)</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y = SomeNat @T (KnownNat @T (SNat @T 2)) (Proxy @T)</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that now the code has two dictionaries with the same type, `KnownNat Any`,</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but they have different implementations, namely `SNat 1` and `SNat 2`. This</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is not good, as GHC assumes coherence, and it is free to interchange</span></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dictionaries of the same type, but in this case this would produce an incorrect</span></span>
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">result. See #16586 for examples of this happening.</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can avoid this problem by making the definition of `someNatVal` opaque</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and we do this by using a `NOINLINE` pragma. This restores coherence, because</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC can only inspect the result of `someNatVal` by pattern matching on the</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">existential, which would generate a new type. This restores correctness,</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">at the cost of having a little more allocation for the `SomeNat` constructors.</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"></span>
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"></span>
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141
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"><span class="cd">-- | @since 4.7.0.0</span></span>
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142
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="kt" style="color: #458; font-weight: 600;">SomeNat</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/59f4cb6fb73ade6f9b0bdc85380dfddba93bf14b#9846aef088bf116a3369196d0218b5d321d825af"><strong>testsuite/tests/lib/base/T16586.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds, PolyKinds, RankNTypes, ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.TypeNats</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Numeric.Natural</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="p">(</span><span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="p">{</span> <span class="n" style="color: #333;">getVal</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">mul</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">KnownNat</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">mul</span> <span class="n" style="color: #333;">mx</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">y</span> <span class="p">`</span><span class="n" style="color: #333;">rem</span><span class="p">`</span> <span class="n" style="color: #333;">fromIntegral</span> <span class="p">(</span><span class="n" style="color: #333;">natVal</span> <span class="n" style="color: #333;">mx</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">pow</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">KnownNat</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">pow</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iterate</span> <span class="p">(`</span><span class="n" style="color: #333;">mul</span><span class="p">`</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!!</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">modl</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">m</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">KnownNat</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Natural</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">modl</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">someNatVal</span> <span class="n" style="color: #333;">m</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SomeNat</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">getVal</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Should print 1</span></span>
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23
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="mi" style="color: #099;">127</span> <span class="p">`</span><span class="n" style="color: #333;">pow</span><span class="p">`</span> <span class="mi" style="color: #099;">31336</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">modl</span><span class="p">`</span> <span class="mi" style="color: #099;">31337</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">dummyValue</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">dummyValue</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="mi" style="color: #099;">33</span> <span class="p">`</span><span class="n" style="color: #333;">pow</span><span class="p">`</span> <span class="mi" style="color: #099;">44</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">modl</span><span class="p">`</span> <span class="mi" style="color: #099;">456</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16586'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'-O2'</span><span class="p">])</span></span></pre>
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