Ensure each code snippet in the docs can be extracted for tests

docs/contracts.rst

@@ -198,7 +198,6 @@ In the following example, ``D``, can call ``c.getData()`` to retrieve the value
         function compute(uint a, uint b) internal returns (uint) { return a+b; }
     }
 
-
     contract D {
         function readData() {
             C c = new C();
@@ -209,7 +208,6 @@ In the following example, ``D``, can call ``c.getData()`` to retrieve the value
         }
     }
 
-
     contract E is C {
         function g() {
             C c = new C();
@@ -238,7 +236,6 @@ be done at declaration.
         uint public data = 42;
     }
 
-
     contract Caller {
         C c = new C();
         function f() {
@@ -321,7 +318,6 @@ inheritable properties of contracts and may be overridden by derived contracts.
         }
     }
 
-
     contract mortal is owned {
         // This contract inherits the "onlyOwner"-modifier from
         // "owned" and applies it to the "close"-function, which
@@ -332,7 +328,6 @@ inheritable properties of contracts and may be overridden by derived contracts.
         }
     }
 
-
     contract priced {
         // Modifiers can receive arguments:
         modifier costs(uint price) {
@@ -342,7 +337,6 @@ inheritable properties of contracts and may be overridden by derived contracts.
         }
     }
 
-
     contract Register is priced, owned {
         mapping (address => bool) registeredAddresses;
         uint price;
@@ -570,7 +564,6 @@ Please ensure you test your fallback function thoroughly to ensure the execution
         function() payable { }
     }
 
-
     contract Caller {
         function callTest(Test test) {
             test.call(0xabcdef01); // hash does not exist
@@ -687,12 +680,19 @@ as topics. The event call above can be performed in the same way as
 
 ::
 
+    pragma solidity ^0.4.10;
+
+    contract C {
+        function f() {
+            bytes32 _id = 0x420042;
             log3(
-        msg.value,
+                bytes32(msg.value),
-        0x50cb9fe53daa9737b786ab3646f04d0150dc50ef4e75f59509d83667ad5adb20,
+                bytes32(0x50cb9fe53daa9737b786ab3646f04d0150dc50ef4e75f59509d83667ad5adb20),
-        msg.sender,
+                bytes32(msg.sender),
                 _id
             );
+        }
+    }
 
 where the long hexadecimal number is equal to
 ``keccak256("Deposit(address,hash256,uint256)")``, the signature of the event.
@@ -734,7 +734,6 @@ Details are given in the following example.
         address owner;
     }
 
-
     // Use "is" to derive from another contract. Derived
     // contracts can access all non-private members including
     // internal functions and state variables. These cannot be
@@ -745,7 +744,6 @@ Details are given in the following example.
         }
     }
 
-
     // These abstract contracts are only provided to make the
     // interface known to the compiler. Note the function
     // without body. If a contract does not implement all
@@ -754,13 +752,11 @@ Details are given in the following example.
         function lookup(uint id) returns (address adr);
     }
 
-
     contract NameReg {
         function register(bytes32 name);
         function unregister();
      }
 
-
     // Multiple inheritance is possible. Note that "owned" is
     // also a base class of "mortal", yet there is only a single
     // instance of "owned" (as for virtual inheritance in C++).
@@ -786,7 +782,6 @@ Details are given in the following example.
         }
     }
 
-
     // If a constructor takes an argument, it needs to be
     // provided in the header (or modifier-invocation-style at
     // the constructor of the derived contract (see below)).
@@ -821,12 +816,10 @@ seen in the following example::
         function kill() { /* do cleanup 1 */ mortal.kill(); }
     }
 
-
     contract Base2 is mortal {
         function kill() { /* do cleanup 2 */ mortal.kill(); }
     }
 
-
     contract Final is Base1, Base2 {
     }
 
@@ -848,7 +841,6 @@ derived override, but this function will bypass
         }
     }
 
-
     contract Base1 is mortal {
         function kill() { /* do cleanup 1 */ super.kill(); }
     }
@@ -858,7 +850,6 @@ derived override, but this function will bypass
         function kill() { /* do cleanup 2 */ super.kill(); }
     }
 
-
     contract Final is Base2, Base1 {
     }
 
@@ -888,7 +879,6 @@ the base constructors. This can be done in two ways::
         function Base(uint _x) { x = _x; }
     }
 
-
     contract Derived is Base(7) {
         function Derived(uint _y) Base(_y * _y) {
         }
@@ -1081,7 +1071,6 @@ more advanced example to implement a set).
       }
     }
 
-
     contract C {
         Set.Data knownValues;
 
@@ -1157,7 +1146,6 @@ custom types without the overhead of external function calls:
         }
     }
 
-
     contract C {
         using BigInt for BigInt.bigint;
 
@@ -1250,7 +1238,6 @@ Let us rewrite the set example from the
       }
     }
 
-
     contract C {
         using Set for Set.Data; // this is the crucial change
         Set.Data knownValues;
@@ -1276,7 +1263,6 @@ It is also possible to extend elementary types in that way::
         }
     }
 
-
     contract C {
         using Search for uint[];
         uint[] data;

docs/control-structures.rst

@@ -363,6 +363,9 @@ As a result, the following code is illegal and cause the compiler to throw an er
 In addition to this, if a variable is declared, it will be initialized at the beginning of the function to its default value.
 As a result, the following code is legal, despite being poorly written::
 
+    pragma solidity ^0.4.0;
+    
+    contract C {
         function foo() returns (uint) {
             // baz is implicitly initialized as 0
             uint bar = 5;
@@ -373,6 +376,7 @@ As a result, the following code is legal, despite being poorly written::
             }
             return bar;// returns 5
         }
+    }
 
 .. index:: ! exception, ! throw, ! assert, ! require, ! revert
 

docs/security-considerations.rst

@@ -179,7 +179,9 @@ Never use tx.origin for authorization. Let's say you have a wallet contract like
         }
     }
 
-Now someone tricks you into sending ether to the address of this attack wallet::
+Now someone tricks you into sending ether to the address of this attack wallet:
+
+::
 
     pragma solidity ^0.4.11;