fix(wasm): use rustc-style multi-line diagnostics instead of one-liner

Author: dylan-sutton-chavez

compiler/src/modules/parser/types.rs

@@ -228,7 +228,6 @@ impl Diagnostic {
     }
 }
 
-#[cfg(not(target_arch = "wasm32"))]
 impl Diagnostic {
     /* rustc-style multi-line render with source preview and caret:
 
@@ -268,8 +267,7 @@ impl Diagnostic {
 }
 
 impl Diagnostic {
-    /* Compact one-line render: `path:line:col: msg`. No source preview.
-       Used by WASM (host renders preview) and by tests. */
+    /* Compact one-line render: `path:line:col: msg`. No source preview. Used by tests. */
     pub fn render_oneline(&self, src: &str, path: Option<&str>) -> alloc::string::String {
         use crate::s;
         let (line, col) = Self::line_col(src, self.start);

compiler/src/wasm.rs

@@ -45,7 +45,7 @@ mod runtime {
             let mut s = String::new();
             for (i, e) in errs.iter().enumerate() {
                 if i > 0 { s.push('\n'); }
-                s.push_str(&s!("syntax error at ", str &e.render_oneline(src, None)));
+                s.push_str(&e.render(src, None));
             }
             s
         } else {