checker: fix one letter receiver panic

2021-01-28 11:05:37 +01:00 · 2021-01-28 11:05:37 +01:00 · 68dab101d9
parent 36e75e5208
commit 68dab101d9
1 changed files with 5 additions and 0 deletions
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@ -5284,6 +5284,11 @@ fn (mut c Checker) fn_decl(mut node ast.FnDecl) {
 		} else if sym.kind == .sum_type && node.name == 'type_name' {
 			c.error('method overrides built-in sum type method', node.pos)
 		}
+		if sym.name.len == 1 {
+			// One letter types are reserved for generics.
+			c.error('unknown type `$sym.name`', node.pos)
+			return
+		}
 		// if sym.has_method(node.name) {
 		// c.warn('duplicate method `$node.name`', node.pos)
 		// }