Report typos in package name if no version matches

src/Composer/DependencyResolver/Problem.php

@@ -33,6 +33,13 @@ class Problem
 
     protected $section = 0;
 
+    protected $pool;
+
+    public function __construct(Pool $pool)
+    {
+        $this->pool = $pool;
+    }
+
     /**
      * Add a rule as a reason
      *
@@ -88,6 +95,10 @@ class Problem
                     return "\n    - The requested linked library ".$job['packageName'].$this->constraintToText($job['constraint']).' has the wrong version installed or is missing from your system, make sure to have the extension providing it.';
                 }
 
+                if (!$this->pool->whatProvides($job['packageName'])) {
+                    return "\n    - The requested package ".$job['packageName'].' could not be found in any version, you most likely did a typo in the package name.';
+                }
+
                 return "\n    - The requested package ".$job['packageName'].$this->constraintToText($job['constraint']).' could not be found.';
             }
         }

src/Composer/DependencyResolver/Solver.php

@@ -83,7 +83,7 @@ class Solver
 
             if ($conflict && RuleSet::TYPE_PACKAGE === $conflict->getType()) {
 
-                $problem = new Problem;
+                $problem = new Problem($this->pool);
 
                 $problem->addRule($rule);
                 $problem->addRule($conflict);
@@ -93,7 +93,7 @@ class Solver
             }
 
             // conflict with another job
-            $problem = new Problem;
+            $problem = new Problem($this->pool);
             $problem->addRule($rule);
             $problem->addRule($conflict);
 
@@ -146,7 +146,7 @@ class Solver
 
                 case 'install':
                     if (!$job['packages']) {
-                        $problem = new Problem();
+                        $problem = new Problem($this->pool);
                         $problem->addRule(new Rule($this->pool, array(), null, null, $job));
                         $this->problems[] = $problem;
                     }
@@ -465,7 +465,7 @@ class Solver
 
     private function analyzeUnsolvable($conflictRule, $disableRules)
     {
-        $problem = new Problem;
+        $problem = new Problem($this->pool);
         $problem->addRule($conflictRule);
 
         $this->analyzeUnsolvableRule($problem, $conflictRule);

tests/Composer/Test/DependencyResolver/SolverTest.php

@@ -75,7 +75,7 @@ class SolverTest extends TestCase
         } catch (SolverProblemsException $e) {
             $problems = $e->getProblems();
             $this->assertEquals(1, count($problems));
-            $this->assertEquals("\n    - The requested package b == 1 could not be found.", $problems[0]->getPrettyString());
+            $this->assertEquals("\n    - The requested package b could not be found in any version, you most likely did a typo in the package name.", $problems[0]->getPrettyString());
         }
     }