IR generator does not handle identifiers in expressions

[SAMBA8695]

Bug Report: IR Generation Does Not Handle Variable References

Description

The parser correctly builds AST nodes for identifiers (AST_VAR), but the IR generation phase does not handle them at all.

As a result, any expression that references a variable is parsed successfully but fails to generate correct IR and LLVM output.

Example Input

let x = 1;
let y = x + 2;

Current Behavior

• AST_VAR nodes are created by the parser
• generate_ir_from_ast() ignores AST_VAR
• IR generation produces incomplete or incorrect LLVM IR
• No error is reported

Expected Behavior

• Identifiers should be translated into IR by loading their values
• Variable declarations should store computed values
• Using an undefined variable should produce an error

Location

• File: irgen.c
• Function: generate_ir_from_ast()