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feat: add ++ concat operator and auto-invoke main

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BUG-004: Add ++ operator for string and list concatenation across all
backends (interpreter, C, JS) with type checking and formatting support.

BUG-001: Auto-invoke top-level `let main = fn () => ...` when main is
a zero-parameter function, instead of just printing the function value.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Brandon Lucas
2026-02-18 22:01:41 -05:00
parent bb0a288210
commit 61e1469845
9 changed files with 110 additions and 7 deletions
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14
src/codegen/c_backend.rs
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@@ -730,10 +730,10 @@ impl CBackend {
}
// Check for string concatenation - use lux_string_concat instead of +
if matches!(op, BinaryOp::Add) {
if matches!(op, BinaryOp::Add | BinaryOp::Concat) {
let left_is_string = self.infer_expr_type(left).as_deref() == Some("LuxString");
let right_is_string = self.infer_expr_type(right).as_deref() == Some("LuxString");
if left_is_string || right_is_string {
if left_is_string || right_is_string || matches!(op, BinaryOp::Concat) {
return Ok(format!("lux_string_concat({}, {})", l, r));
}
}
@@ -2839,8 +2839,18 @@ impl CBackend {
}
}
// String concatenation for ++ and +
if matches!(op, BinaryOp::Add | BinaryOp::Concat) {
let left_is_string = self.infer_expr_type(left).as_deref() == Some("LuxString");
let right_is_string = self.infer_expr_type(right).as_deref() == Some("LuxString");
if left_is_string || right_is_string || matches!(op, BinaryOp::Concat) {
return Ok(format!("lux_string_concat({}, {})", l, r));
}
}
let op_str = match op {
BinaryOp::Add => "+",
BinaryOp::Concat => unreachable!("handled above"),
BinaryOp::Sub => "-",
BinaryOp::Mul => "*",
BinaryOp::Div => "/",