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<pre id='vimCodeElement'>
<span class="Comment">//: So far we've been calling a fixed recipe in each instruction, but we'd</span>
<span class="Comment">//: also like to make the recipe a variable, pass recipes to "higher-order"</span>
<span class="Comment">//: recipes, return recipes from recipes and so on.</span>
<span class="Delimiter">:(scenario call_literal_recipe)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>call f<span class="Delimiter">,</span> <span class="Constant">34</span>
]
recipe f x:number <span class="Delimiter">-></span> y:number [
local-scope
load-ingredients
y<span class="Special"> <- </span>copy x
]
<span class="traceContains">+mem: storing 34 in location 1</span>
<span class="Delimiter">:(scenario call_variable)</span>
recipe main [
<span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe number <span class="Delimiter">-></span> number<span class="Delimiter">)}</span><span class="Special"> <- </span>copy f
<span class="Constant">2</span>:number<span class="Special"> <- </span>call <span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe number <span class="Delimiter">-></span> number<span class="Delimiter">)},</span> <span class="Constant">34</span>
]
recipe f x:number <span class="Delimiter">-></span> y:number [
local-scope
load-ingredients
y<span class="Special"> <- </span>copy x
]
<span class="traceContains">+mem: storing 34 in location 2</span>
<span class="Delimiter">:(before "End Mu Types Initialization")</span>
put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"recipe-literal"</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Comment">// 'recipe' variables can store recipe-literal</span>
type_ordinal recipe = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"recipe"</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> recipe<span class="Delimiter">).</span>name = <span class="Constant">"recipe"</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Null-type is_disqualified Exceptions")</span>
if <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second && contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second = new string_tree<span class="Delimiter">(</span><span class="Constant">"recipe-literal"</span><span class="Delimiter">);</span>
x<span class="Delimiter">.</span>type = new type_tree<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"recipe-literal"</span><span class="Delimiter">));</span>
x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
CALL<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">"call"</span><span class="Delimiter">,</span> CALL<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
case CALL: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
raise_error << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"'call' requires at least one ingredient (the recipe to call)</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!is_mu_recipe<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise_error << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"first ingredient of 'call' should be a recipe, but got "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case CALL: <span class="Delimiter">{</span>
<span class="Comment">// Begin Call</span>
if <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
++Trace_stream<span class="Delimiter">-></span>callstack_depth<span class="Delimiter">;</span>
trace<span class="Delimiter">(</span><span class="Constant">"trace"</span><span class="Delimiter">)</span> << <span class="Constant">"indirect 'call': incrementing callstack depth to "</span> << Trace_stream<span class="Delimiter">-></span>callstack_depth << end<span class="Delimiter">();</span>
assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth < <span class="Constant">9000</span><span class="Delimiter">);</span> <span class="Comment">// 9998-101 plus cushion</span>
<span class="Delimiter">}</span>
const instruction& caller_instruction = current_instruction<span class="Delimiter">();</span>
Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
ingredients<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">());</span> <span class="Comment">// drop the callee</span>
finish_call_housekeeping<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">,</span> ingredients<span class="Delimiter">);</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: check types for 'call' instructions</span>
<span class="Delimiter">:(scenario call_check_literal_recipe)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>call f<span class="Delimiter">,</span> <span class="Constant">34</span>
]
recipe f x:boolean <span class="Delimiter">-></span> y:boolean [
local-scope
load-ingredients
y<span class="Special"> <- </span>copy x
]
<span class="traceContains">+error: main: ingredient 0 has the wrong type at '1:number <- call f, 34'</span>
<span class="traceContains">+error: main: product 0 has the wrong type at '1:number <- call f, 34'</span>
<span class="Delimiter">:(scenario call_check_variable_recipe)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
<span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe boolean <span class="Delimiter">-></span> boolean<span class="Delimiter">)}</span><span class="Special"> <- </span>copy f
<span class="Constant">2</span>:number<span class="Special"> <- </span>call <span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe boolean <span class="Delimiter">-></span> boolean<span class="Delimiter">)},</span> <span class="Constant">34</span>
]
recipe f x:boolean <span class="Delimiter">-></span> y:boolean [
local-scope
load-ingredients
y<span class="Special"> <- </span>copy x
]
<span class="traceContains">+error: main: ingredient 0 has the wrong type at '2:number <- call {1: (recipe boolean -> boolean)}, 34'</span>
<span class="traceContains">+error: main: product 0 has the wrong type at '2:number <- call {1: (recipe boolean -> boolean)}, 34'</span>
<span class="Delimiter">:(after "Transform.push_back(check_instruction)")</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_indirect_calls_against_header<span class="Delimiter">);</span> <span class="Comment">// idempotent</span>
<span class="Delimiter">:(code)</span>
void check_indirect_calls_against_header<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <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 'call' instructions inside recipe "</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << end<span class="Delimiter">();</span>
const recipe& caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>long long int 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>
const instruction& inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation != CALL<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// error raised above</span>
const reagent& callee = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
if <span class="Delimiter">(</span>!is_mu_recipe<span class="Delimiter">(</span>callee<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// error raised above</span>
const recipe callee_header = is_literal<span class="Delimiter">(</span>callee<span class="Delimiter">)</span> ? get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>value<span class="Delimiter">)</span> : from_reagent<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
if <span class="Delimiter">(</span>!callee_header<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long int i = <span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> i < min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
raise_error << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"ingredient "</span> << i-<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span> << <span class="Constant">" has the wrong type at '"</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
for <span class="Delimiter">(</span>long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>products<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
raise_error << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"product "</span> << i << <span class="Constant">" has the wrong type at '"</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
recipe from_reagent<span class="Delimiter">(</span>const reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">-></span>value == <span class="Constant">"recipe"</span><span class="Delimiter">);</span>
recipe result_header<span class="Delimiter">;</span> <span class="Comment">// will contain only ingredients and products, nothing else</span>
result_header<span class="Delimiter">.</span>has_header = <span class="Constant">true</span><span class="Delimiter">;</span>
const string_tree* curr = r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">-></span>right<span class="Delimiter">;</span>
for <span class="Delimiter">(;</span> curr<span class="Delimiter">;</span> curr=curr<span class="Delimiter">-></span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>curr<span class="Delimiter">-></span>value == <span class="Constant">"->"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
curr = curr<span class="Delimiter">-></span>right<span class="Delimiter">;</span> <span class="Comment">// skip delimiter</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
result_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">"recipe:"</span>+curr<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
for <span class="Delimiter">(;</span> curr<span class="Delimiter">;</span> curr=curr<span class="Delimiter">-></span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
result_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">"recipe:"</span>+curr<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> result_header<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
bool is_mu_recipe<span class="Delimiter">(</span>reagent r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">-></span>value == <span class="Constant">"recipe"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">-></span>value == <span class="Constant">"recipe-literal"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Comment">// End is_mu_recipe Cases</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario copy_typecheck_recipe_variable)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># abc def</span>
<span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe number <span class="Delimiter">-></span> number<span class="Delimiter">)}</span><span class="Special"> <- </span>copy f <span class="Comment"># store literal in a matching variable</span>
<span class="Delimiter">{</span><span class="Constant">2</span>: <span class="Delimiter">(</span>recipe boolean <span class="Delimiter">-></span> boolean<span class="Delimiter">)}</span><span class="Special"> <- </span>copy <span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe number <span class="Delimiter">-></span> number<span class="Delimiter">)}</span> <span class="Comment"># mismatch between recipe variables</span>
]
recipe f x:number <span class="Delimiter">-></span> y:number [
local-scope
load-ingredients
y<span class="Special"> <- </span>copy x
]
<span class="traceContains">+error: main: can't copy {1: (recipe number -> number)} to {2: (recipe boolean -> boolean)}; types don't match</span>
<span class="Delimiter">:(scenario copy_typecheck_recipe_variable_2)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
<span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>recipe number <span class="Delimiter">-></span> number<span class="Delimiter">)}</span><span class="Special"> <- </span>copy f <span class="Comment"># mismatch with a recipe literal</span>
]
recipe f x:boolean <span class="Delimiter">-></span> y:boolean [
local-scope
load-ingredients
y<span class="Special"> <- </span>copy x
]
<span class="traceContains">+error: main: can't copy f to {1: (recipe number -> number)}; types don't match</span>
<span class="Delimiter">:(before "End Matching Types For Literal(to)")</span>
if <span class="Delimiter">(</span>is_mu_recipe<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> from<span class="Delimiter">.</span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise_error << <span class="Constant">"trying to store recipe "</span> << from<span class="Delimiter">.</span>name << <span class="Constant">" into "</span> << debug_string<span class="Delimiter">(</span>to<span class="Delimiter">)</span> << <span class="Constant">" but there's no such recipe</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
const recipe& rrhs = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> from<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
const recipe& rlhs = from_reagent<span class="Delimiter">(</span>to<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>rrhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> rrhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
for <span class="Delimiter">(</span>long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>products<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>rrhs<span class="Delimiter">.</span>products<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> rrhs<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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