<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I've responded on the MR. Thanks for stepping up to do this!<div class=""><br class=""></div><div class="">Richard<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Dec 30, 2019, at 5:53 AM, Rowan Goemans <<a href="mailto:goemansrowan@gmail.com" class="">goemansrowan@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
  

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      !important; float: none;" class="">Hello everyone,</span><br style="color:
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    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
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    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
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      !important; float: none;" class="">A couple of days ago I tried to
      implement type level warnings [1]. I have got something</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
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    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
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      !important; float: none;" class="">now that sort of works but issues the
      same warning multiple times and not on the correct</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
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    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
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      !important; float: none;" class="">location. It's currently a WIP merge
      request [2]. I would like some help/pointers</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
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    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
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      !important; float: none;" class="">to continue the implementation</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
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    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
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    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
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      !important; float: none;" class="">The approach I have taken is to issue
      the warning once TypeWarning is rewritten.</span><br style="color:
      rgb(85, 85, 85); font-family: "Source Sans Pro",
      sans-serif; font-size: 18px; font-style: normal;
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    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
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      !important; float: none;" class="">However,</span><span style="color:
      rgb(85, 85, 85); font-family: "Source Sans Pro",
      sans-serif; font-size: 18px; font-style: normal;
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      !important; float: none;" class=""><span class=""> </span>this has severe problems
      since now a warning is issued multiple times and</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
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      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
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      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">at different locations due to the<span class=""> </span></span><span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
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      start; text-indent: 0px; text-transform: none; white-space:
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      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">rewriting</span><span style="color:
      rgb(85, 85, 85); font-family: "Source Sans Pro",
      sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
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      !important; float: none;" class=""><span class=""> </span>happening multiple times.
      I don't know</span><br style="color: rgb(85, 85, 85); font-family:
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      background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
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      start; text-indent: 0px; text-transform: none; white-space:
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      !important; float: none;" class="">what the best location is to do this
      check and issue the warning. Prior to</span><br style="color:
      rgb(85, 85, 85); font-family: "Source Sans Pro",
      sans-serif; font-size: 18px; font-style: normal;
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      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
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      !important; float: none;" class="">constraint solving isn't a good place
      since the TypeWarning could be nested</span><br style="color:
      rgb(85, 85, 85); font-family: "Source Sans Pro",
      sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
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      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">deeply in some constraint. Afterwards
      also isn't doable since then the</span><br style="color: rgb(85,
      85, 85); font-family: "Source Sans Pro", sans-serif;
      font-size: 18px; font-style: normal; font-variant-ligatures:
      normal; font-variant-caps: normal; font-weight: 400;
      letter-spacing: normal; orphans: 2; text-align: start;
      text-indent: 0px; text-transform: none; white-space: normal;
      widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">TypeWarning constraint is gone.</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">An alternative could be to not implement
      any instance in for TypeWarning</span><br style="color: rgb(85,
      85, 85); font-family: "Source Sans Pro", sans-serif;
      font-size: 18px; font-style: normal; font-variant-ligatures:
      normal; font-variant-caps: normal; font-weight: 400;
      letter-spacing: normal; orphans: 2; text-align: start;
      text-indent: 0px; text-transform: none; white-space: normal;
      widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">similar to TypeError and special case it
      somehow.</span><br style="color: rgb(85, 85, 85); font-family:
      "Source Sans Pro", sans-serif; font-size: 18px;
      font-style: normal; font-variant-ligatures: normal;
      font-variant-caps: normal; font-weight: 400; letter-spacing:
      normal; orphans: 2; text-align: start; text-indent: 0px;
      text-transform: none; white-space: normal; widows: 2;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">Any help is appreciated!</span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">[1]
      <a class="moz-txt-link-freetext" href="https://gitlab.haskell.org/ghc/ghc/issues/17027">https://gitlab.haskell.org/ghc/ghc/issues/17027</a></span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">[2]
      <a class="moz-txt-link-freetext" href="https://gitlab.haskell.org/ghc/ghc/merge_requests/2361">https://gitlab.haskell.org/ghc/ghc/merge_requests/2361</a></span><br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">Best regards,</span><br style="color:
      rgb(85, 85, 85); font-family: "Source Sans Pro",
      sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <br style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial;" class="">
    <span style="color: rgb(85, 85, 85); font-family: "Source Sans
      Pro", sans-serif; font-size: 18px; font-style: normal;
      font-variant-ligatures: normal; font-variant-caps: normal;
      font-weight: 400; letter-spacing: normal; orphans: 2; text-align:
      start; text-indent: 0px; text-transform: none; white-space:
      normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width:
      0px; background-color: rgb(255, 255, 255); text-decoration-style:
      initial; text-decoration-color: initial; display: inline
      !important; float: none;" class="">Rowan<span class=""> </span></span><span class="hiddenSpellError" style="background-color: rgba(255, 0, 0,
      0.2); cursor: pointer; color: rgb(85, 85, 85); font-family:
      "Source Sans Pro", sans-serif; font-size: 18px;
      font-style: normal; font-variant-ligatures: normal;
      font-variant-caps: normal; font-weight: 400; letter-spacing:
      normal; orphans: 2; text-align: start; text-indent: 0px;
      text-transform: none; white-space: normal; widows: 2;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;
      text-decoration-style: initial; text-decoration-color: initial;">Goemans</span>
  </div>

_______________________________________________<br class="">ghc-devs mailing list<br class=""><a href="mailto:ghc-devs@haskell.org" class="">ghc-devs@haskell.org</a><br class="">http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs<br class=""></div></blockquote></div><br class=""></div></body></html>