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<span class="Comment">//: Construct types out of their constituent fields.</span>
<span class="Delimiter">:(scenario merge)</span>
container foo [
<span class="Normal">x</span>:num
<span class="Normal">y</span>:num
]
def main [
<span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
<span class="traceContains">+mem: storing 3 in location 1</span>
<span class="traceContains">+mem: storing 4 in location 2</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
MERGE<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"merge"</span><span class="Delimiter">,</span> MERGE<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span class="Normal">case</span> MERGE: <span class="Delimiter">{</span>
<span class="Comment">// type-checking in a separate transform below</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> MERGE: <span class="Delimiter">{</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> ++j<span class="Delimiter">)</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: type-check 'merge' to avoid interpreting numbers as addresses</span>
<span class="Delimiter">:(scenario merge_check)</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario merge_check_missing_element)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span>
]
<span class="traceContains">+error: main: too few ingredients in '1:point <- merge 3'</span>
<span class="Delimiter">:(scenario merge_check_extra_element)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">,</span> <span class="Constant">5</span>
]
<span class="traceContains">+error: main: too many ingredients in '1:point <- merge 3, 4, 5'</span>
<span class="Comment">//: We want to avoid causing memory corruption, but other than that we want to</span>
<span class="Comment">//: be flexible in how we construct containers of containers. It should be</span>
<span class="Comment">//: equally easy to define a container out of primitives or intermediate</span>
<span class="Comment">//: container fields.</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers)</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
<span class="Constant">1</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">1</span>:point<span class="Delimiter">,</span> <span class="Constant">5</span>
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers_2)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
<span class="Constant">2</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">1</span>:point
]
<span class="traceContains">+error: main: too few ingredients in '2:point-number <- merge 1:point'</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers_3)</span>
def main [
<span class="Constant">1</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">,</span> <span class="Constant">5</span>
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers_4)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
<span class="traceContains">+error: main: too few ingredients in '1:point-number <- merge 3, 4'</span>
<span class="Delimiter">:(scenario merge_check_reflexive)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
<span class="Constant">2</span>:point<span class="Special"> <- </span>merge <span class="Constant">1</span>:point
]
$error: <span class="Constant">0</span>
<span class="Comment">//: Since a container can be merged in several ways, we need to be able to</span>
<span class="Comment">//: backtrack through different possibilities. Later we'll allow creating</span>
<span class="Comment">//: exclusive containers which contain just one of rather than all of their</span>
<span class="Comment">//: elements. That will also require backtracking capabilities. Here's the</span>
<span class="Comment">//: state we need to maintain for backtracking:</span>
<span class="Delimiter">:(before "End Types")</span>
<span class="Normal">struct</span> merge_check_point <span class="Delimiter">{</span>
reagent container<span class="Delimiter">;</span>
<span class="Normal">int</span> container_element_index<span class="Delimiter">;</span>
merge_check_point<span class="Delimiter">(</span><span class="Normal">const</span> reagent& c<span class="Delimiter">,</span> <span class="Normal">int</span> i<span class="Delimiter">)</span> :container<span class="Delimiter">(</span>c<span class="Delimiter">),</span> container_element_index<span class="Delimiter">(</span>i<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span class="Delimiter">};</span>
<span class="Normal">struct</span> merge_check_state <span class="Delimiter">{</span>
stack<merge_check_point> data<span class="Delimiter">;</span>
<span class="Delimiter">};</span>
<span class="Delimiter">:(before "End Checks")</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_merge_calls<span class="Delimiter">);</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_merge_calls<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">const</span> recipe& caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- type-check merge instructions in recipe "</span> << caller<span class="Delimiter">.</span>name << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">const</span> instruction& inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">"merge"</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'merge' should yield a single product in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Comment">// Update product While Type-checking Merge</span>
<span class="Normal">const</span> type_tree* product_base_type = product<span class="Delimiter">.</span>type<span class="Delimiter">-></span>atom ? product<span class="Delimiter">.</span>type : product<span class="Delimiter">.</span>type<span class="Delimiter">-></span>left<span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>product_base_type<span class="Delimiter">-></span>atom<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>product_base_type<span class="Delimiter">-></span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_base_type<span class="Delimiter">-></span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'merge' should yield a container in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">const</span> type_info& info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_base_type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind != CONTAINER && info<span class="Delimiter">.</span>kind != EXCLUSIVE_CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'merge' should yield a container in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
check_merge_call<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">,</span> product<span class="Delimiter">,</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> check_merge_call<span class="Delimiter">(</span><span class="Normal">const</span> vector<reagent>& ingredients<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& product<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller<span class="Delimiter">,</span> <span class="Normal">const</span> instruction& inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">int</span> ingredient_index = <span class="Constant">0</span><span class="Delimiter">;</span>
merge_check_state state<span class="Delimiter">;</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
<span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << ingredient_index << <span class="Constant">" vs "</span> << SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index >= SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too few ingredients in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent& container = state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!container<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// error handled elsewhere</span>
<span class="Normal">const</span> type_tree* top_root_type = container<span class="Delimiter">.</span>type<span class="Delimiter">-></span>atom ? container<span class="Delimiter">.</span>type : container<span class="Delimiter">.</span>type<span class="Delimiter">-></span>left<span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>top_root_type<span class="Delimiter">-></span>atom<span class="Delimiter">);</span>
type_info& container_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> top_root_type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Normal">switch</span> <span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>kind<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">case</span> CONTAINER: <span class="Delimiter">{</span>
<span class="Comment">// degenerate case: merge with the same type always succeeds</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span> && types_coercible<span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Normal">const</span> reagent& expected_ingredient = element_type<span class="Delimiter">(</span>container<span class="Delimiter">.</span>type<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"checking container "</span> << to_string<span class="Delimiter">(</span>container<span class="Delimiter">)</span> << <span class="Constant">" || "</span> << to_string<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">)</span> << <span class="Constant">" vs ingredient "</span> << ingredient_index << end<span class="Delimiter">();</span>
<span class="Comment">// if the current element is the ingredient we expect, move on to the next element/ingredient</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>types_coercible<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
++ingredient_index<span class="Delimiter">;</span>
++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> root_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-></span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too many ingredients in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// if not, maybe it's a field of the current element</span>
<span class="Normal">else</span> <span class="Delimiter">{</span>
<span class="Comment">// no change to ingredient_index</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// End check_merge_call Cases</span>
<span class="Normal">default</span>: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>container<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"incorrect type of ingredient "</span> << ingredient_index << <span class="Constant">" in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
raise << <span class="Constant">" (expected '"</span> << debug_string<span class="Delimiter">(</span>container<span class="Delimiter">)</span> << <span class="Constant">"')</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
raise << <span class="Constant">" (got '"</span> << debug_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">))</span> << <span class="Constant">"')</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
++ingredient_index<span class="Delimiter">;</span>
<span class="Comment">// ++state.data.top().container_element_index; // unnecessary, but wouldn't do any harm</span>
<span class="Normal">do</span> <span class="Delimiter">{</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too many ingredients in '"</span> << inst<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
<span class="Delimiter">}</span> <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> root_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-></span>value<span class="Delimiter">).</span>elements<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// never gets here</span>
assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario merge_check_product)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:num<span class="Special"> <- </span>merge <span class="Constant">3</span>
]
<span class="traceContains">+error: main: 'merge' should yield a container in '1:num <- merge 3'</span>
<span class="Delimiter">:(before "End Includes")</span>
<span class="PreProc">#include </span><span class="Constant"><stack></span>
<span class="Normal">using</span> std::stack<span class="Delimiter">;</span>
</pre>
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