Add elm syntax regression test

tests/syntax-tests/source/Elm/LICENSE.md

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+The `test.elm` file has been added from [https://elm-lang.org/examples/triangle] under the following license:
+
+Copyright (c) 2012-present Evan Czaplicki
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Evan Czaplicki nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

tests/syntax-tests/source/Elm/test.elm

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+-- elm install elm-explorations/linear-algebra
+-- elm install elm-explorations/webgl
+
+
+import Browser
+import Browser.Events as E
+import Html exposing (Html)
+import Html.Attributes exposing (width, height, style)
+import Math.Matrix4 as Mat4 exposing (Mat4)
+import Math.Vector3 as Vec3 exposing (Vec3, vec3)
+import WebGL
+
+
+
+-- MAIN
+
+
+main =
+  Browser.element
+    { init = init
+    , view = view
+    , update = update
+    , subscriptions = subscriptions
+    }
+
+
+
+-- MODEL
+
+
+type alias Model =
+  Float
+
+
+init : () -> (Model, Cmd Msg)
+init () =
+  ( 0, Cmd.none )
+
+
+
+-- UPDATE
+
+
+type Msg
+  = TimeDelta Float
+
+
+update : Msg -> Model -> (Model, Cmd Msg)
+update msg currentTime =
+  case msg of
+    TimeDelta delta ->
+      ( delta + currentTime, Cmd.none )
+
+
+
+-- SUBSCRIPTIONS
+
+
+subscriptions : Model -> Sub Msg
+subscriptions _ =
+  E.onAnimationFrameDelta TimeDelta
+
+
+
+-- VIEW
+
+
+view : Model -> Html msg
+view t =
+  WebGL.toHtml
+    [ width 400, height 400, style "display" "block"
+    ]
+    [ WebGL.entity vertexShader fragmentShader mesh { perspective = perspective (t / 1000) }
+    ]
+
+
+perspective : Float -> Mat4
+perspective t =
+  Mat4.mul
+    (Mat4.makePerspective 45 1 0.01 100)
+    (Mat4.makeLookAt (vec3 (4 * cos t) 0 (4 * sin t)) (vec3 0 0 0) (vec3 0 1 0))
+
+
+
+-- MESH
+
+
+type alias Vertex =
+  { position : Vec3
+  , color : Vec3
+  }
+
+
+mesh : WebGL.Mesh Vertex
+mesh =
+  WebGL.triangles
+    [ ( Vertex (vec3 0 0 0) (vec3 1 0 0)
+      , Vertex (vec3 1 1 0) (vec3 0 1 0)
+      , Vertex (vec3 1 -1 0) (vec3 0 0 1)
+      )
+    ]
+
+
+
+-- SHADERS
+
+
+type alias Uniforms =
+  { perspective : Mat4
+  }
+
+
+vertexShader : WebGL.Shader Vertex Uniforms { vcolor : Vec3 }
+vertexShader =
+    [glsl|
+        attribute vec3 position;
+        attribute vec3 color;
+        uniform mat4 perspective;
+        varying vec3 vcolor;
+
+        void main () {
+            gl_Position = perspective * vec4(position, 1.0);
+            vcolor = color;
+        }
+    |]
+
+
+fragmentShader : WebGL.Shader {} Uniforms { vcolor : Vec3 }
+fragmentShader =
+    [glsl|
+        precision mediump float;
+        varying vec3 vcolor;
+
+        void main () {
+            gl_FragColor = vec4(vcolor, 1.0);
+        }
+    |]