Version:            (using Devel)
Installed from:    Compiled sources

The "not" keyword is not known by the parser. Adding the following code:

if (not 1) {

}

This lets kdevelop underline the letter 'n'. In the problems section there is: Condition expected.

The C++ standard states in §2.11.2:

Furthermore, the alternative representations shown in Table 4 for certain operators and punctuators (2.5) are reserved and shall not be used otherwise:

Table 4 — alternative representations

and        and_eq      bitand     bitor
compl      not         not_eq     or
or_eq      xor         xor_eq       


$2.12 states:

1 The lexical representation of C++ programs includes a number of preprocessing tokens which are used in the syntax of the preprocessor or are converted into tokens for operators and punctuators:

preprocessing-op-or-punc: one of
{          }          [         ]          #          ##         (        )
<:         :>         <%        %>         %:         %:%:       ;        :     ...
new        delete     ?         ::         .          .*
+          -          *         /          %          ˆ          &        |     ˜
!          =          <         >          +=         -=         *=       /=    %=
ˆ=         &=         |=        <<         >>         >>=        <<=      ==    !=
<=         >=         &&        ||         ++         --         ,        ->*   ->
and        and_eq     bitand    bitor      compl      not        not_eq
or         or_eq      xor       xor_eq

Each preprocessing-op-or-punc is converted to a single token in translation phase 7 (2.1).