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A single-line comment in Dart is a lexical construct ignored by the Dart compiler, designed to embed non-executable text within the source code. It is initiated by the double forward-slash token (//). During the tokenization phase, the Dart lexical analyzer discards all characters starting from the // token up to the immediate end-of-line (EOL) sequence. Dart recognizes a line feed (\n), a standalone carriage return (\r), or a carriage return followed by a line feed (\r\n) as valid line terminators. Syntax 
// This is a standalone single-line comment.
Inline Placement A single-line comment can be appended to the end of a valid Dart statement. The compiler processes the executable statement and ignores the subsequent comment token along with its trailing text. 
int counter = 0; // The comment begins here and ends at the line break.
Lexical Behavior Because the lexical analyzer terminates the comment at the first line break, single-line comments cannot span multiple physical lines. Furthermore, any additional // tokens placed within an already initiated single-line comment are simply consumed as ignored raw text rather than nested comment tokens. 
// This is a valid comment // with an ignored secondary token.
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